System of Equations- pls help with the following problem


Solve the System of equations x = -2 ; y = 3 .(Choose from a,b, or c. Show your work step by step).

a) x+y=1


2x+y=5





b) x+2y = 4


x +y = 1




c) x-y=-5


x+y= 11



Pls show your work as I want to understand how to solve this type of equation.