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Linear equations in one variable SAT question

Math · Algebra · Easy · Answer it here, explanation included.

If $7 x = 28$ , what is the value of $8 x$ ?

ExplanationShow

Choice B is correct. Dividing both sides of the given equation $7 x = 28$ by $7$ yields $x = 4$ . Substituting $4$ for $x$ in the expression $8 x$ yields $8 (4)$ , which is equivalent to $32$ .

Choice A is incorrect. This is the value of $\frac{21}{4} x$ .

Choice C is incorrect. This is the value of $42 x$ .

Choice D is incorrect. This is the value of $56 x$ .

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