Question

x- 2y = &3 x + 4 Y =
20

Answer 1

x - 2y = 3x + 4y = 20

x - 2y = 20

x = 20 - 2y

3x + 4y = 20

3(20 - 2y) + 4y = 20

60 - 6y + 4y = 20

60 - 2y = 20

2y = 40

y = 20

x = 20 - 2y

x = 20 - 40

x = -20