SOLUTION: Hello! I need help in solving a system of equation. The answers were provided but I don't understand how problem was solved. The system of equation is: y=2x+3 y=-x-9 The answe

Algebra ->  Linear-equations -> SOLUTION: Hello! I need help in solving a system of equation. The answers were provided but I don't understand how problem was solved. The system of equation is: y=2x+3 y=-x-9 The answe      Log On


   



Question 816017: Hello! I need help in solving a system of equation. The answers were provided but I don't understand how problem was solved. The system of equation is:
y=2x+3
y=-x-9
The answer is: (-4,-5)
Thank you in advance for the help!

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
since both = y set them equal to each other
\
2x+3=-x-9
add x
3x+3=-9
subtrac 3
3x=-12
divide by 3
x=-4
y=-x-9
y=-(-4)-9
y=-5