Question

If 2t + 3 = -9, what is the value of -3t - 7?

Answer 1

11

Explanation:

first solve 2t+3=-9 for t

2t+3=-9 subtract 3 from both sides

-3 -3

2t=-12 now divide both sides by 2

÷2 ÷2

t=-6

now plug in -6 for t in -3t-7

-3(-6)-7=? multiply -3 and -6

18-7=?

11

Answer 2

11

Explanation:

2t + 3 = -9 lets us solve for t by isolating the variable. first we can subtract 3 from both sides to get rid of it on the left side of the equation. That gives us 2t = -12. Then we can divide by 2 to isolate t completely. Now we have t = -6.

We can use this in the 2nd equation to just plug in t. -3t - 7 = -3(-6) - 7. We multiply -3 and -6 and get 18 because the negatives cancel out when multiplying 2 negative numbers together. The equation is now 18 -7 which is equal to 11.