Answer:
x + 2y = 7.........(1)
x - y = 4 ...........(2)
Step-by-step explanation:
subtracting equation 2 from 1
x+2y=7
x-y=4
-
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2y--y=7-4
3y=3
y=3/3=1
multiplying equation 2 by 2
2x-2y=8............(3)
adding equation 1 and 3
2x-2y=8
x+2y=7
+
------------------
2x+x=8+7
3x=15
x=15/3=5
:.x=5
:.y=1
