SAT Linear equations in one variable Practice Question 12 (Medium)

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Question bank / Linear equations in one variable

Math · AlgebraMedium

What is the solution to the equation $0.4(x + 15) = 0.6x - 2$ ?

$4$

$20$

$40$

$85$

Show answer and explanation

Answer: C

Distribute: $0.4x + 6 = 0.6x - 2$ . Subtract $0.4x$ and add 2 to both sides: $8 = 0.2x$ . Divide by $0.2$ : $x = 40$ .

Choice D comes from failing to distribute the $0.4$ to the 15, which gives $0.4x + 15 = 0.6x - 2$ .

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