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!

step-by-step explanation:

always plug in x. in this case, x equals 4.

i'm going to first solve 4(2+3x)

1) 4(2+3(4)) use pemdas to solve.

i'm going to multiply whats in the parenthesis first, so 3 times 4=12.

2)4 (2+12) i'm then going to multiply 4 by both numbers in the parenthesis (because multiplying comes before adding)

4 times 2= 8.   4 times 12= 48

4) (8+48)= 56 (answer)

i'm then going to solve 8+12x and plug in 4 for x.

1) 8 +12(4)

multiplying comes before adding, so i'm gonna multiply 12 and 4.

12 times 4= 48.

2) 8+48=56

both equal the same!