Question

2x+y = 11 and 7x-4y=-14. using substitution method​

Answer 1

Step-by-step explanation:

2x + y = 11 → y = 11 - 2x (1)

7x-4y = -14 (2)

Substituring (1) into (2), we have

7x - 4(11 - 2x) = -14 simplify

7x - 44 + 8x = -14

15x - 44 = - 14 add 44 to both sides

15x = 30 divide both sides by 15

x = 2 and using (1) to find y, we have y = 11 - 2(2) = 11 - 4 = 7

Answer 2

Answer:

2x+y=11×7

7x-4y=-14×2

14x+7y-77=0

14x-8y+28=0

- + -

__________

+15y-105=0

15y=105

y=105÷5

y=21

2x+21=11

2x=11-21

x=-10/2

x=-5