1)
2x=3-7y
x=(3-7y)/2
x=-3,5y+1,5

7y=3-2x
y=(3-2x)/7
y=-(2/7)*x +3/7
2)
8x=3y+20
x=(3y+20)/8
x=(3/8)*y +2,5
x=0,375x+2,5

3y=8x-24
y=(8x-24)/3
y=(2 2/3) *x -8