16Hit1600
AlgebraEasyFinding x from a two-variable equation

Algebra practice question

For the equation x − 4y = 8, what is the value of x when y = −1?

Answer: 4

x − 4(−1) = x + 4 = 8, so x = 4.

Common wrong answers

If you answered 8
8 ignores the y term.
If you answered 12
12 treats −4(−1) as −4 and adds 4 to 8.
If you answered -4
−4 has the sign wrong.

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