Question

2x+5=y+10 y-3=x-4
Sistema Linear.

Answer 1

2x+5=y+10     y=x-4+3  
y-3=x-4

2x+5=x-4+3+10
2x-x=4
x=4  

y=4-4+3
y=3

Bons Estudos  ;)  

Answer 2

{2x+5=y+10
{y-3=x-4

{2x-y=5
{-x+y=-1    +
-------------
x=4

Se y-3=x-4 sendo x=4, entao:
y-3=4-4
y=3