Solve the system by either elimination or substitution

3x-5y=21

2x+y=1

A. 2,-3

B. 2,3

C.-2,-1

D.-2,1

My guess is c

The correct answer is A: x=2 and y=-3. Either method would work, but for example, let's use elimination. If you multiply the second equation by 5, you get: 10x + 5y = 5. When you add both equations, you can then cross out both y terms. You are left with one equation that reads: 13x=26. Solving for x gives you 2. You can substitute 2 in for x in either equation and you will receive - 3 for your y value.