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

11

Step-by-step 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

11

Step-by-step 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.