plumv2145
03.06.2021 •
Mathematics
-2x + 3y = 18. x = -y + 1
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Ответ:
D
Step-by-step explanation:
Ответ:
D. X=-3, y=4
Step-by-step explanation:
-2x+3y=18 equation 1
x=-y+1 equation 2
-2(-y+1)+3y=18 replace x value of equation 2 into equation 1
2y-2+3y=18
5y=20
y=4
solve for x by replacing y value into either equation.
x=-y+1
x=-4+1
x=-3
Ответ: