SOLUTION: For each systems of equations below, choose the best method for solving and solve. y=-x-6 x+3y = -18

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Question 1150315: For each systems of equations below, choose the best method for solving and solve.
y=-x-6
x+3y = -18
Found 2 solutions by josmiceli, MathTherapy:
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
(1)
(2)
---------------------------
(1)
(2) Add the equations
---------------------------


Now plug this result back into either equation
(1)
(1)
(1)
-----------------------
check answers:
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
OK
Answer by MathTherapy(10555)   (Show Source): You can put this solution on YOUR website!
For each systems of equations below, choose the best method for solving and solve.
y=-x-6
x+3y = -18
y = - x - 6 ------- eq (i)

x + 3y = - 18 ----- eq (ii)

The OBVIOUS EASIEST and therefore BEST method is SUBSTITUTION, so IGNORE what the other person stated.

1)  SUBSTITUTE - x - 6 for y in eq (ii). You'll then find the value of x.

2)  Substitute the value of x into eq (i) to get the value of y.

That's IT!! Does it get any EASIER? 

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