Question

3n - 7m for n = 5 amd m = 4

Answer 1

-13
3x5=15
7x4=28
15-28= -13

Answer 2

-13

Explanation:

first you will subsitute 5 for n in the equation to get 3(5)-7m

next you will subsitute 4 for m in the equation to get 3(5)-7(4)

then solve: 3x5= 15

7x4= 28

15-28= -13