Last updated: October 22, 2026 · Written by the Math Made Easy math teachers

The final problems write equations from word situations and solve formulas for one letter (A-CED.A.1 and A-CED.A.4), so keep the units attached and check each answer.
Standards: A-REI.A.1, A-REI.B.3, A-CED.A.1, A-CED.A.4 · Level: Grade 9 Algebra 1
Problem 2 Distribute and solve ★★★
Solve 5(x − 3) = 35.
Problem 3 A fraction on the variable ★★★
Solve x4 + 3 = 8.
Problem 4 Negative coefficient ★★★
Solve 9 − 2x = −7.
Problem 5 Justify each step ★★★
Solve 4x − 7 = 21, and write the property that justifies each step.
Problem 6 Variables on both sides ★★★
Solve 5x − 8 = 2x + 19.
Problem 7 Distribute on the left ★★★
Solve 3(2x − 1) = 4x + 9.
Problem 8 Fraction coefficient ★★★
Solve 56x − 4 = 21.
Problem 9 Fractions on both sides ★★★
Solve x + 54 = x − 12.
Problem 10 Decimal equation ★★★
Solve 0.4x + 1.5 = 0.15x + 4.
Problem 11 No solution ★★★
Solve 4(x + 2) = 4x + 5. The graph shows both sides.
Problem 12 Every number works ★★★
Solve 10x + 15 = 5(2x + 3).
Problem 13 Find the error ★★★
A student solved 5(x − 2) = 3x + 6 and wrote 5x − 2 = 3x + 6 in the first step. Describe the error and solve correctly.
Problem 14 Triangle area formula ★★★
Solve A = ½bh for h.
Problem 15 Comparing gym plans ★★★
Gym A charges $25 to join plus $12 each month. Gym B charges $40 to join plus $9 each month. After how many months is the total cost the same?
Problem 16 Taxi fare ★★★
A taxi charges $3.50 plus $2.25 per mile. Write an equation and find how many miles are in a $21.50 fare.
Problem 17 Temperature formula ★★★
Solve F = 95C + 32 for C, then find C when F = 95.
Problem 18 Perimeter of a triangle ★★★
The perimeter of the triangle is 62 inches. Find x and all three side lengths.
Problem 19 Missing base of a trapezoid ★★★
A trapezoid has area A = ½h(b₁ + b₂). Solve for b₂, then find b₂ when A = 84, h = 7 and b₁ = 9.
Problem 20 Robotics fundraiser ★★★
A robotics club needs $1,260. It already has $245 and earns $35 profit on each kit it sells. Write an equation and find the number of kits needed.
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