x+y=4;2x-y=1 simultaneous equations
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x+y=4
x=4-y
2x-y = 1
2(4-y)-y=1
8-2y-y=1
-3y=-7
3y=7
y=7/3
,now x = 4-7/3
=12/3-7/3
=5/3=x
x=4-y
2x-y = 1
2(4-y)-y=1
8-2y-y=1
-3y=-7
3y=7
y=7/3
,now x = 4-7/3
=12/3-7/3
=5/3=x
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