How do you solve this problem using elimination:
-3x+4y=29
3x=2y=-17
2007-12-09 06:52:50 · 8 answers · asked by holly 2 in Science & Mathematics ➔ Mathematics
sorry there IS a typo! it is supposed to be + not =
2007-12-09 07:14:22 · update #1
-3x + 4y = 29
3x - 2y = -17
---------------------
2y = 12
y = 6
-3x+ 4(6) = 29
-3x + 24 = 29
-3x = 5
x = -5/3
If there was supposed to be a + sign where the first set of equal signs is then this way
-3x + 4y = 29
3x + 2y = -17
-------------------
6y = 12
y = 2
-3x + 4(2) = 29
-3x + 8 = 29
-3x = 21
x = -7
I'm thinking it is the second way that I worked it. Hope this helps
2007-12-09 06:58:29 · answer #1 · answered by Ms. Exxclusive 5 · 0⤊ 1⤋
If there is no typing error:
-3X + 4Y = 29 Add both equations
3X - 2Y =-17
-------------------
2Y = 12 Divide by 2 both sides of equation
Y = 6
Substitute 6 for Y
3X - 12 = -17: 3X = -5: X= -5/3 = -1+2/3
I believe that there is a "typo" in this question
2007-12-09 15:13:45 · answer #2 · answered by gzlakewood@sbcglobal.net 4 · 0⤊ 0⤋
The equations don't work. I think you meant to write
3x+ 2y= -17 for equation 2?
rearrange eqn.1: 4y= 29+3x
therefore 2y= 14.5 +1.5x
sub in eqn. 2: 3x+ (14.5+ 1.5x)= -17
4.5x = -31.5
divide by 4.5: x= -7
sub into eqn. 1: -3(-7) +4y=29
21+4y+29
4y= 8
y= 2
2007-12-09 15:07:26 · answer #3 · answered by Just me 5 · 0⤊ 0⤋
you add the equations together since by doing so the x terms will eliminate themselves
-3x + 4y = 29
3x + 2y = -17
__________
0 + 6y = 12
solve for y, divide by 6
y = 2
Now put 2 back into original equation (either one) for y and solve for x
-3x + 4(2) = 29
-3x + 8 = 29
-3x = 21
x = -7
answer(-7, 2)
2007-12-09 14:58:34 · answer #4 · answered by Linda K 5 · 0⤊ 0⤋
assuming you mean
-3x + 4y = 29
3x + 2y = -17
you add those to eliminate the x varaible
6y = 12, y = 2
plug 2 into one of them to find x
3x + 2(2) = -17
3x = -21
x = -7
2007-12-09 14:59:10 · answer #5 · answered by Blueberry Man 5 · 0⤊ 0⤋
-3x+4y=29
3x+2y=-17
Just add the two equations, getting:
6y = 12
y = 2
Then 3x +2(2) = -17
3x = -21
x = -7
2007-12-09 14:58:50 · answer #6 · answered by ironduke8159 7 · 0⤊ 0⤋
first solve for one of the variables in either of the equation.
substitute it in the other equation (the one which is still in terms of 2 vars) ..
you will get the answer for the 1 variable you solved for .. plug it into any of the other equations you hvae .. and solve for the 2nd unknown var.
there solved using elimination
2007-12-09 14:57:01 · answer #7 · answered by sudhi_kandi 3 · 0⤊ 1⤋
Is there a typo?
2007-12-09 14:57:26 · answer #8 · answered by Vince H 3 · 0⤊ 0⤋