Question

4x+5y=5 4x+10y=7 reduccion

Answer 1

 4x+5y=5
-(4x+10y=7)
0x-5y=-2
-5y=-2
y=2/5

4x+5(2/5)=5
4x+2=5
4x=3
x=3/4

4x+10y=7
4(3/4)+10(2/5)=7
3+4=7
7=7

4(3/4)+5(2/5)=5
3+2=5
5=5

x= 3/4
y=2/5