Ответ:
y=7-5x
3x+2y=21
3x+2(7-5x)=21
3x+14-10x=21
-7x=7
x=-1
y=7-5×(-1)
y=12
(-1;12)
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Ответ:
y=7-5x
3x+2y=21
3x+2(7-5x)=21
3x+14-10x=21
-7x=7
x=-1
y=7-5×(-1)
y=12
(-1;12)