How to Enter “No Solution” on DeltaMath

Quick Answer

Type No Solution with a capital N and capital S. DeltaMath also accepts DNE on many problem types. Four entries that will always be marked wrong:

  • no solution — lowercase fails
  • No Solution. — punctuation fails
  • none or null — not recognized
  • Leaving the field blank — counts as skipped, not correct

1. Exact Entries and When to Use Each

No Solution

The standard entry for equations and systems that have no valid answer. Capital N, capital S, single space between the two words, no punctuation. This is what DeltaMath expects on linear equation contradictions, inconsistent systems of equations, and absolute value problems where the right-hand side is negative. If the problem asks you to solve and there is no value of x that makes the equation true, type No Solution.

DNE

Short for “Does Not Exist.” DeltaMath accepts DNE on many of the same problem types that accept No Solution, but it’s more commonly expected on limit problems in precalculus and calculus, and on problems asking whether a value, expression, or operation is defined. All three letters uppercase, no periods between them: DNE not D.N.E. If you’re unsure whether the problem expects No Solution or DNE, check for a formatting hint below the answer box. When there’s no hint, try No Solution first — it’s the more broadly accepted entry across algebra problem types.

Infinite Solutions

The opposite of No Solution, and a common source of confusion. Infinite Solutions means every value of x satisfies the equation — this happens when both sides of an equation simplify to the same expression (e.g. 3x + 6 = 3x + 6). Type Infinite Solutions with capitals. Do not type ∞, all real numbers, or infinitely many — none of these are accepted. Getting No Solution and Infinite Solutions mixed up is one of the most common errors on DeltaMath — see Section 3 for how to tell them apart.

The empty set symbol (ø)

Some teachers write ø on the board to represent no solution. DeltaMath does not accept this symbol as a valid answer entry. If you paste or type ø into the answer field, it will be marked wrong regardless of whether your math is correct. Always use No Solution in text form.

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2. No Solution Formatting Reference Card

Four answer types students confuse on DeltaMath. Green is what the platform accepts. Red is what gets rejected.

DeltaMath No Solution / DNE Reference Situation Type This Never This Equation has no valid answer No Solution no solution / none Limit or value does not exist DNE dne / D.N.E. Every value of x satisfies the equation Infinite Solutions ∞ / all reals Teacher writes ∅ on the board No Solution ∅ (not accepted) Green = accepted by DeltaMath Red = rejected regardless of correct math finishmymathclass.com

For exponent formatting rules, see How to Type Exponents in DeltaMath.

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3. Problem Types That Produce No Solution

One of the most frustrating situations on DeltaMath is not knowing whether your answer is wrong because your math is wrong, or because you should be entering “No Solution” instead of a number. The four problem types below consistently produce no solution — recognizing them saves you from chasing an answer that doesn’t exist.

Linear equation contradictions

When you simplify both sides of a linear equation and end up with a false statement like 4 = 7 or −2 = 3, the equation has no solution. The most common version: an equation where x cancels out on both sides and leaves two unequal constants. Example: 2x + 5 = 2x − 3 simplifies to 5 = −3, which is never true. The answer is No Solution. Compare this to 2x + 5 = 2x + 5, which simplifies to 5 = 5 (always true) — that’s Infinite Solutions, not No Solution.

Inconsistent systems of equations

A system of two linear equations has no solution when the lines are parallel — same slope, different y-intercepts. The lines never intersect, so there’s no (x, y) pair that satisfies both equations simultaneously. On DeltaMath, these problems often ask you to solve by substitution or elimination. When elimination produces a false constant equation (like 0 = 8), the system is inconsistent and the answer is No Solution.

Absolute value contradictions

An absolute value equation has no solution when it’s set equal to a negative number. Since absolute value always produces a non-negative result, |x + 3| = −5 is impossible regardless of what x is. DeltaMath includes these regularly in absolute value units, and students sometimes waste time trying to solve them when the correct answer is simply No Solution.

Compound inequalities with no overlap

An “and” compound inequality requires both conditions to be true simultaneously. When the two conditions are mutually exclusive — for example, x < 2 AND x > 7 — there is no value of x that satisfies both. The answer is No Solution. This is different from an “or” compound inequality, which has a solution as long as either condition is satisfied.

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4. Get Help With DeltaMath

Getting marked wrong when you know the answer is No Solution?

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5. Frequently Asked Questions

Does capitalization actually matter for No Solution on DeltaMath?
Yes. DeltaMath’s answer checker is case-sensitive on text entries. no solution and NO SOLUTION are both rejected. The only accepted form is No Solution with capital N and capital S. Same rule applies to Infinite Solutions and DNE — exact capitalization required.
When should I use DNE instead of No Solution?
DNE is most commonly expected in precalculus and calculus contexts — limits that don’t exist, operations that are undefined, or values that can’t be determined. For standard algebra problems (linear equations, systems, absolute value), No Solution is the more broadly accepted entry. When in doubt, check for a formatting hint below the answer box. If there’s no hint and both seem plausible, try No Solution first.
What’s the difference between No Solution and Infinite Solutions?
No Solution means no value of x makes the equation true. Infinite Solutions means every value of x makes it true. The tell: after simplifying, if you get a false statement (5 = −3), it’s No Solution. If you get a true statement (0 = 0 or 5 = 5), it’s Infinite Solutions. These are exact opposites and getting them confused is one of the most common errors on DeltaMath algebra assignments.
Can I use the empty set symbol ∅ on DeltaMath?
No. DeltaMath does not recognize ∅ as a valid answer entry. Some teachers use ∅ to represent no solution in class, but the platform only accepts the text form No Solution. Typing or pasting ∅ into the answer field will be marked wrong every time.
What if I leave the answer blank instead of typing No Solution?
Leaving the field blank is treated as a skipped or incorrect answer — not a correct one. In skill builder mode this extends the set with additional problems. Always type something. If you believe the answer is no solution, type No Solution explicitly.
How do I know if my math is wrong vs. the answer really being No Solution?
Work through the algebra fully before deciding. For linear equations: get all x terms on one side. If x disappears and you’re left with a false statement (like 4 = 9), the answer is No Solution. If x disappears and you’re left with a true statement (like 4 = 4), it’s Infinite Solutions. If x is still present, keep solving — there is a numerical answer. Students most often confuse a sign error mid-problem for a no-solution result, so check your algebra before typing No Solution.
Does DeltaMath accept “No Solution” for absolute value equations?
Yes. When an absolute value equation is set equal to a negative number — like |x + 2| = −4 — the answer is No Solution because absolute value can never produce a negative result. Type No Solution in the answer field. Some versions of this problem type also accept DNE, but No Solution is safer.
Can Finish My Math Class help with DeltaMath no solution problems?
Yes. FMMC handles full DeltaMath assignments — our experts know what each problem type expects, including when No Solution, DNE, or Infinite Solutions is the correct entry and how to format it so the platform accepts it. See our DeltaMath help page for details or get a free quote.

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