Решите систему уравнений 3x + y = 0; 5x - y =8
{3x+y=0
{5x-y=8
y=-3x
5x-(-3x)=8
5x+3x=8
8x=8
x=1
y=-3*1=-3.
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{3x+y=0
{5x-y=8
y=-3x
5x-(-3x)=8
5x+3x=8
8x=8
x=1
y=-3*1=-3.