SOLUTION: y=3x x+2y=-21

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Question 62881: y=3x
x+2y=-21
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
Y=3X THEN SUBSTITUTING (3X) FOR Y WE GET
X+2*3X=-21
X+6X=-21
7X=-21
X=-21/7
X=-3
Y=3*-3
Y=-9
PROOF
-3+2Y=-21
-3+2Y=-21
2Y=-21+3
2Y=-18
Y=-18/2
Y=-9
PROOF
-9=3*-3
-9=-9