SOLUTION: -5x+2y=-10 3x-6y=-18 what would be the steps and the answer to this problem in substitution, elimination and how would it be graphed. PLEASE HELP ME!!!!!!

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Question 230788: -5x+2y=-10
3x-6y=-18
what would be the steps and the answer to this problem in substitution, elimination and how would it be graphed. PLEASE HELP ME!!!!!!
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
1) -5x+2y=-10
2) 3x-6y=-18
what would be the steps and the answer to this problem in substitution, elimination and how would it be graphed.
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Substitution:
Solve the 1st for y they substitute that into the 2nd
1)y = (5/2)x -5
2) 3x -6(5/2)x-5) = -18
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Solve 2nd for "x"
3x-15x+30 = -18
-12x = -48
x = 4
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Substitute that into y = (5/2)x-5 to solve for "y":
y = (5/2)4-5 = 5
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Solution (4,5)
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1) -5x+2y=-10
2) 3x-6y=-18
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Elimination:
Multiply thru 1st by 3 to get:
1) -15x+6y = -30
2) 3x-6y = -18
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Add and solve for "x"
-12x = -48
x = 4
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Substitute that into 1st or 2nd and solve for "y":
3*4-6y = -18
12-6t = -18
-6y = -30
y = 5
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Same solution as above
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1) -5x+2y=-10
2) 3x-6y=-18
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Graphing:
Solve each equation for "y":
1) y = (5/2)x-5
2: y = (1/2)x+3
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Plot two points for each of the equations.
Drar a line thru each pair of points and
find the intersection.
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Cheers,
Stan H.