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

Step-by-step explanation:

So we know that:

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

So first, substitute 8 into the first equation:

Solve for t. Subtract 2 from both sides:

Divide both sides by 2:

Now, substitute this into the second equation for t:

Subtract:

So, the value of y is -18.

And we're done!

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step-by-step explanation: