2x + 3y = 16
x - 3y = 14
5x + y = 15
10x - y = 15
4y + x = 27
y - x = 3
decrease £220,000 by 20%
10% from 150
3x + y = 18
x - y = 2
2a - a + 5a = -12
150.00 - 10%
5a - b
a = 3
b = -18
150 - 10%
