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2x+y=4 (3) 6x+3y=12 -
-7y=2, y=-2/7
3x-2(-2/7)=7
3x=7-4/7
3x =45/7
x=45/7x1/3=15/7
-2(15/7)=3(-2/7)
-30/7=-6/7
2x+y =4 ×2 4x + 2y = 8 +
7x = 15
x = 15/7
2x+y=4
2.15/7 + y = 4
30/7 + y = 4
y = 4 × 7/30
y = 28/30
y = 14/15