Question

a)

x + y = 20
x - y = 8

b)

2x = 3y
3x - 2y = -6

Answer 1

a) x = -8 + y

 -8 + y + y = 20
2y = 28
y = 14

x = 14 -8
x = 6

b) x = 3y/2

3(3y/2) -2y = -6
9y -2y = -12
y = -12/7

x = -36/14
x = -18/7