In such type of questions, all that you are supposed to do is, use basic mathematics to eliminate any one of the given two variables.
Check out the equations if in case you can multiply any of the given ones with a -1 and add the two equations,eliminating one of the variables.
2x-3y=9 -5x-3y=30 Multiply the first equation by negative one to cancel out the Ys -2x+3y=-9 -5x-3y=30 Add the equations -7x=21 X=-3 plug in X in one of the original equations
