2x+10=9-12-3y
21+6x+4y=8x+20
2x+3y=-13
-2x+4y=-1
7x=-14
x=-2
2*(-2)+3y=-13
-4+3y=-13
3y=-13+4
3y=-9
y=-3
(-2;-3)
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Verified answer
2(х+5)=9-3(4+у)21+6х+4у=4(2х+5)
2х+10=9-12-3у
21+6х+4у=8х+20
2х+3у=-13
-2х+4у=-1
3у=-13
4у=-1
7у=-14
у=-2
2х+3*(-2)=-13
2х-6=-13
2х=-7
х=-3,5
Ответ:(-3,5;-2)
2x+10=9-12-3y
21+6x+4y=8x+20
2x+3y=-13
-2x+4y=-1
7x=-14
x=-2
2*(-2)+3y=-13
-4+3y=-13
3y=-13+4
3y=-9
y=-3
(-2;-3)