amandaestevez030
19.02.2020 •
Mathematics
Y = 7x + 9
2y + 2x = -18
Solved
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Ответ:
x=-9/4, y=-27/4. (-9/4, -27/4).
Step-by-step explanation:
y=7x+9
2y+2x=-18
simplify 2y+2x=-18 into y+x=-9
7x+9+x=-9
8x+9=-9
8x=-9-9
8x=-18
x=-18/8
simplify
x=-9/4
y=7(-9/4)+9=-63/4+9=-27/4
Ответ: