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322126
03.02.2021 •
Mathematics
Solve the simultaneous equations
-x + 4y = 12
x + y = - 7
Solved
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Ответ:
y = 1, x = - 8
or
(-8, 1)
Step-by-step explanation:
-x + 4y = 12
x + y = -7
add the equations together
0x + 5y = 5
5y = 5
y = 1
substitute y for 1 in one of the original equations to find x
x + y = -7
x + 1 = -7
x + 1 - 1 = - 7 - 1
x = - 7 - 1
x = -8
Ответ:
y = 1, x = - 8 or (-8,1)
Step-by-step explanation:
Ответ:
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Step-by-step explanation:
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