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Heisbrandon · Answer 1 · 2019-09-11T21:49:47+0000

An expression involving a variable is a way to express an idea, rather than a specific number. So, writing
5x-7 means that there is a certain quantity, x, and you want to multiply it by 5, and then subtract 7.

Note that we don't want to know the value of x, we're only saying that we will multiply it by 5 and then subtract 7.

So, if we know that x=9, we will multiply it by 5 and then subtract 7:

$5x-7 = 5\cdot 9 - 7 = 45-7 = 38$

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