Question 26479
First solve one of the equations for one of the variables;
Lets solve the first equation for y;
4x+y=160
y=160-4x
Now substitute that into the next equation for y;
12x-13(160-4x)=-160
12x-2080+52x=-160
12x+52x=-160+2080
64x=1920
x=30
Now that we have what x= lets find y;
4(30)+y=160
120+y=160
y=160-120
y=40
Hope you understand
=)