Question 919988: How to solve this? our lesson is about elimination.
1) 3x+y= 2
9x+2y= 7
2) x-y=- 7
3x+y= 19
3) 4x+y= 6
x-2y= 15
4) 2x+y= 10
4x+2y= 5
5) -x+3y= -2
-3x+9y= -6 Found 2 solutions by Fombitz, ewatrrr:Answer by Fombitz(32388) (Show Source):
You can put this solution on YOUR website! 1) Multiply the first equation by -2 and add the equations together. You eliminate y.
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2) Add the equations together. You eliminate y.
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3) Multiply the first equation by 2 and add the equations together. You eliminate y.
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4) Multiply the first equation by -2 and add the equations together. You eliminate y.
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5) Multiply the first equation by -3 and add the equations together. You eliminate y.
You can put this solution on YOUR website! I will Start You out by finding one variable: Plug and Play to find the Other.
1)
-2(3x+y= 2) 9x+2y= 7
6x = 9, x = 3 , , y = -7
(3, - 7) the Solution this System
...........
2)
x-y=- 7 3x+y= 19
4x = 12, x = 3
..........
3)
2(4x+y= 6) x-2y= 15
9x = 27, x = 3
.........
4)
-2(2x+y= 10) 4x+2y= 5
0 ≠ -15 NO Solution
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5)
-3(-x+3y= -2) -3x+9y= -6
0 = 0 Infinte Solutions (Same Line)
