SAT math level 1 question?

2016-12-20 11:25 am

If x + x + x = y, then x - y =

Explanation on how to get answer

回答 (4)

2016-12-24 8:23 am

If x + x + x = y, then x - y = -2x

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2016-12-20 6:14 pm

y = 3x

x - 3x = - 2x

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2016-12-20 1:25 pm

x + x + x = y

2x + x = y (Do NOT combine all the x's into 3x!!!!)

2x = y - x

2x = -1(x - y)

-2x = x - y. Final.

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2016-12-20 11:33 am

Note: x + x + x = y is the same as 3(x) = y

So just substitute 3(x) for y in the following: x - y
So we compute

= x - 3(x)

= -2(x)

in terms of x.

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