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Suppose that x = 2+2t and y = t - 21. If x = 8, what is y?

User Zelibobla
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1 Answer

6 votes

Answer:


y=-18

Explanation:

So we know that:


x=2+2t\text{ and}\\y=t-21

And we want to figure out the value of y when x is 8.

So first, substitute 8 into the first equation:


8=2+2t

Solve for t. Subtract 2 from both sides:


6=2t

Divide both sides by 2:


t=3

Now, substitute this into the second equation for t:


y=(3)-21

Subtract:


y=-18

So, the value of y is -18.

And we're done!

User AngleUr
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