SAT Math Question for the week of 08/22/2021

The equation ax + b = -5x + b has infinitely many solutions, where a and b are constants. What is the value of a?

Maps to Category 10 of the book.

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Answer posted on 08/29/2021: Answer is -5.

For an equation to have infinitely many solutions, expressions on both side of the equation must be equal. Since the value of constant b is same on both sides, a must be -5.