nutellangie
16.07.2019 •
Mathematics
Solve the simultaneous equation2x-y=8x+y=7show all working out .
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Ответ:
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:
Ответ:
32 ibsgstsvsbstysusisjsh yfsusiajab tayshbs
Step-by-step explanation: