Please Help. Solve using Cramer's Rule. x+2y=5, -3x+y=13?

Answer 1

determinant 1 2
......................-3 1 = 1x1 - 2x(-3) = 7

determinant 5 2
...................13 1 = 5x1 - 2x13 = -21

determinant 1 5
.....................-3 13 = 1x13 - 5(-3) = 13 + 15 = 28

x = -21/7 = -3 and y = 28/7 = 4

Answer 2

x + 2y =5
-3x + y = 13 multiply both sides of this to give
-6x + 2y =26

subtract the first one from the second one, to give
-7x =21
divide both sides by -7 and you get
x = -3