Question

-2x+3y=1
4x-5y=0 equaçoes

Answer 1

-2x+3y=1
3y=2x+1
y=2x+1/3

4x-5y=0
4x-5(2x+1/3)=0
4x-(10x-5/3)=0
12x-10x-5/3=0/3
12x-10x-5=0
2x=5
x=5/2

y=2x+1/3
y=2(5/2)+1/3
y=2

Answer 2

4x=5y logo, x=5y/4
Depois substitui, sendo:
-2(5y/4)+3y=1
-10y/4+3y=1
-10y+12y=4
2y=4
y=2

Logo x valerá 5.(2)/4 = 2,5