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12.01.2021 •
Mathematics
Please helpp it would mean a lottt:)
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Ответ:
(-8,-2)
Step-by-step explanation:
x=2y-4 (equation 1)
7x+5y=-66 (equation2)
Substitute equation 1 in 2
7(2y-4)+5y=-66
14y-28+5y=-66
19y= -66+28
19y= -38
y= -38/19
—>y=-2
Now substitute y=-2 in equation 1
x=2y-4
x=2(-2)-4
x=-4-4
—> x=-8
==>(-8,-2)
Ответ: