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10x + 20 y = 90 |× 3
- 30x -30y = -60
30x + 60 y = 90
30y=30
y = 1
3x +3×1=6
3x + 3=6
3x=9
x=3
b) 5x +7y=17| x3
3x + 5 y =11|-x5
15x + 21y=51
-15x - 25y = -55
-4y=-4
y=1
5x + 7x1=17
5x +7=17
5x+10
x=2