Question

решите систему уравнений
4x=-6y
7y-2x=20

Answer 1

2x=-3y
7y-2x=20

2x=-3y
7y-(-3y)=20

2x=-3y
7y+3y=20

2x=-3y
10y=20

x=-1.5y
y=20:10

x=-1.5y
y=2

x=-1.5*2
y=2

x=-3
y=2