X=3/2; Y=4/5
X=63/19; Y=17/19
X=163/46; Y=-123/46
4y+3x=8; 8x-9y=-77
10x+18y=-22; 16x-9y=-10
5x+7y=-1; -3x+5y=-24
15x+11y=64; 7y-9x=16
x+3y=6; 5x-4y=13
4x+5y=10; -10y-4x=-14
x-5y=16; -7x+8y=50
