Question 452212: solve the system by graphing:
y=-x-2
y=2x+13
Found 3 solutions by mananth, ikleyn, josgarithmetic:
Answer by mananth(16949)   (Show Source):
Answer by ikleyn(53746)  (Show Source):
You can put this solution on YOUR website! Graphs/452212: solve the system by graphing:
y=-x-2
y=2x+13
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My vision is that the instruction "solve the system by graphing" looks slightly idiotic
as considered to this problem. So, I will solve it in a normal way, i.e. algebraically.
Notice that the post b @mananth does not contain any solution.
Left sides of equations are identical - so, their right side equal
-x - 2 = 2x + 13.
Simply and find x
-x - 2x = 13 + 2,
-3x = 15,
x = 15/(-3) = -5.
Hence, y = -x - 2 = -(-5) - 2 = 5 - 2 = 3.
ANSWER. The solution is x = -5, y = 3.
You may substitute these values into equations to assure that they are the correct solutions,
i.e. do satisfy equations.
Solved algebraically, i.e. in a normal way.
Answer by josgarithmetic(39792)  (Show Source):
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