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2x+3y=18 |3|6x+9y=54
---------- -
-13y=-52
y=4.
2x+3y=18
2x=6
x=3
2x +3y = 18 (×3) = 6x + 9y = 54
-------------------- -
- 13 y = - 52
y = - 52 ÷ -13
y = 4
3x - 2y = 1
3x - 2(4) = 1
3x - 8 = 1
3x =1 + 8
3x = 9
x =9÷3
x = 3