Solve by the addition method:
2x+4y=-2
3x-y=11
2007-12-02 08:55:44 · 4 answers · asked by tianna_85902 1 in Science & Mathematics ➔ Mathematics
2x + 4y = - 2
12x - 4y = 44----ADD
14x = 42
x = 3
6 + 4y = - 2
4y = - 8
y = - 2
x = 3 , y = - 2
2007-12-02 10:33:58 · answer #1 · answered by Como 7 · 2⤊ 1⤋
right here is an occasion: 25) 2x - 5y = 4 (answer:12/11, - 4/11) 3x - 2y = 4 Multiply by way of equation by utilising 3 to get: 6x - 15y = 12 Multiply by way of equation 2 by utilising 2 to get: 6x - 4y = 8 Subtract equation 2 from equation a million to do away with x: 6x - 15y = 12 -(6x - 4y = 8) ------------------- 0x - 11y = 4 Divide the two factors by utilising -11: y = -4/11 replace that fee for y in the two of the two unique equations to clean up for x. 2x - 5(-4/11) = 4 2x + 20/11 = 4 2x = 40 4/11 - 20/11 2x = 24/11 x = 12/11
2016-11-13 07:12:35 · answer #2 · answered by slayden 4 · 0⤊ 0⤋
to do this problem, you have to solve for x or y first, then set the equations equal to eachother:
2x+4y=-2
2x=-4y-2
x=-2y-1
________
->replace the x in the second equation with the new equation above.
3(-2y-1)-y=11
-6y-3-y=11
-7y=14
y=-2
_______
to find x, replace the y with -2 in either problem.
2x+4(-2)=-2
2x-8=-2
2x=6
x=3
so your answers are: x=3, y=-2
:-)
2007-12-02 09:08:39 · answer #3 · answered by Lindsey 3 · 1⤊ 2⤋
x=3...y=-2..
Fae... check you answer... you did it all wrong.
2007-12-02 09:07:30 · answer #4 · answered by andrewshain 2 · 1⤊ 1⤋