SOLUTION: solve by using the best method for each system. 3x-3y=18 and x+y=3

Question 27654: solve by using the best method for each system.
3x-3y=18 and
x+y=3
Answer by askmemath(368) (Show Source): You can put this solution on YOUR website!
3x-3y=18
x+y=3
Multiplying the 2nd equation with 3
3x+3y = 9
Now, adding both
6x = 27

X = 4.5
Putting this value back into any equation we get Y = -1.5

Solved by pluggable solver: Linear System solver (using determinant)

Solve:

Any system of equations:

has solution

(x=4.5, y=-1.5}

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving -3*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=-1.5. Since , x=4.5.

Answer: .

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