3 years ago

Solve the simultaneous equation2x-y=8x+y=7SHOW ALL WORKING OUT PLEASE. THANKS

1 answer:

5 0

2x-y=8...(1)
x+y=7....(2)

from (2)
y=7-x....(3)

put (3) into (1)
2x-(7-x)=8
2x-7+x=8
2x+x=8+7
3x=15
x=5.....(4)

put (4) into (2)
x+y=7
5+y=7
y=7-5
y=2

Hope it helps c:

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