1. solve the system by substitution.
[-2.5x+y=13.5
12.25x - y=-12.25
(-5.1)
(-1,5)
(1.-5)
(5.-1)

2

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

17

step-by-step explanation: