x+y=13
3x-y=3
and
5x+y=3
7x-3y=31
3x-y=3
and
5x+y=3
7x-3y=31
-
1. x=4, y=9
and
2. x=17/11, y= -6.09
and
2. x=17/11, y= -6.09
-
Multiply the first equation by -3. And solve for y then plug back to solve for x.
For the second second multiply the first equation by 3 and solve for x and plug back to get y.
For the second second multiply the first equation by 3 and solve for x and plug back to get y.