Question

Solve the following using
matrix inversion method
7x-2y=17
3x+4y=17

Answer 1

y=2

Explanation:

7x-2y=17....1

3x+4y=17...2

multiply 1by 2

then

subtract 1 and 2

14x -4y=34

3x +4y=17

from this

17x=51

x=3

then from 1

7(3)-2y=17

21-2y=17

-2y=17-21

-2y=-4

y=4/2

y=2