SOLUTION: How do I substitute a problem like this? y = x + 3 y = 2x + 12

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Question 456599: How do I substitute a problem like this?
y = x + 3
y = 2x + 12
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
y = x + 3
y = 2x + 12
SO
x+3 = 2x+12
2x-x=3-12
x=-9
plug value of x in 1
y=x+3
y=-9+3
y=-6
(-6,-9)is the ordered solution