Question 175330
If you plug in the x and y values for b you will find it incorrect.

x=-9,y=7 

2x+3y=41   -18+21=39 
 2x-3y=-13 -18-21=-39

2x+3y=41
2x-3y=-13

Add each column

4x+0=28

divide both sides by 4
x=7

Plug in the value of 7 for x to get the y value

14+3y=41

Subtract 14 from both sides

3y=27

divide both sides by 3

y=9

Plug in the values of x and y in the second equation

(2*7)-(3*9)=-13

-13=-13