Question 298800
Starting with:
5x-y=13
x+2y=1
.
Multiply both sides of the top equation by 2:
10x-2y=26
x+2y=1
.
Add the two equations together:
10x-2y=26
  x+2y=1
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11x   =27
x = 27/11
.
Plug the above into:
x+2y=1
27/11+2y=1
Solve for y:
27+22y=11
22y = -16
y = -16/22
y = -8/11
.
Solution:
x = 27/11
y = -8/11