seren67 seren67

16-10-2020
Mathematics

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If y= -7(-2-2x), what is the value of x when y is equal to 70?

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alondratorrespaonte alondratorrespaonte

16-10-2020

x = 4.

Substitute 70 in for the y.
70 = -7(-2-2x)

Then multiply everything inside the parenthesis by -7.
70 = 14 + 14x

Then subtract 14 on both sides
56 = 14x

Divide by 14 on both sides
x = 4

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