Question

Solve the system of equations

x + y = 5

x - y = -9

Answer 1

\[x + y = 5\]\[x - y = -9\]Add:\[2x=-4\]
\[x=-2\]\[y=7\]

Answer 2

x + y = 5
x - y = -9

add the above 2 equations to get 2x=-4

solve for x. we get x=-2

put this value in any one of the given equations and get value of y
x + y = 5
-2+y=5
y=7

so x=-2 and y=7