Question

Use Cramer's rule to find the solution of the system of equations. write as ordered pair
{3x+y=5
2x-3y=18

Answer 1

get the determinant first
3 1
2 -3
the determinant is -9-2=-11

Answer 2

then just replace the variable you want to solve for with the answer like in the other problem

Answer 3

so it would be
5 1
18 -3 to find x right?

Answer 4

yup

Answer 5

which would be -33?

Answer 6

and then you divide that by the det, which is -11 so x=-33/-11=3
x=3

Answer 7

3 5
2 18
which =44?
44/-11=4
y=4 right?

Answer 8

44/-11 =-4 not 4

Answer 9

and yeah if you plug it back into the original equation it works :D

Answer 10

oh, okay got it I actually know how to do those now thanks so much!

Answer 11

np