2x -2y = -10, y= -2x + 17
I got
2x -2(-2x + 17) = -10
2x -4x + 38 = -10
this is far as I got,,can somebody advise me on this
2007-07-13 15:38:29 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2x-2y=-10
-2y=-10 +2x
2y= 10 -2x
y=5-x
Substitute
y=-2x+17 so...
5-x=-2x+17
5+x=17
x=12
plug back in to the original
2(12) -2y=-10
24-2y=-10
-2y=-36
y=18
On your second step you multiplied -2 onto -2x+17 which should be +4x -34...you got the sign (+ or -) wrong and 2 times 17 is 34 not 38
2007-07-13 15:43:01 · answer #1 · answered by Carter G 4 · 0⤊ 0⤋
You're on the right track, but watch your signs and multiplication. -2(-2x+17) equals +4x - 34.
Keep going and...
2x+4x-34 = -10
6x=24
x = 4
Then: 2(4)-2y= -10
8-2y = -10
-2y = -18
y=9
2007-07-13 22:43:33 · answer #2 · answered by Isaac 4 · 0⤊ 0⤋
You should start out by subsituting for y:
2x-2(-2x+17) = -10
which then becomes:
2x+4x-34=-10.
Subtract -34 from both sides and add 2x and 4x...
6x = 24
x=4.
Then substitute x=4 into the second equation:
y = -2x+17
y = -2(4) + 17
y = -8 + 17
y = 9.
Your answers are x=4, y=9.
2007-07-13 22:44:31 · answer #3 · answered by cyarnall80 1 · 0⤊ 0⤋
2x -2y = -10, y= -2x + 17
I got
2x -2(-2x + 17) = -10
2x -4x + 38 = -10 *****should be 2x+4x-34=-10 add 34 to each side
6x=24 divide both sides by 6
x=4
y=-2x+17
y=-2*4+17
y=-8+17
y=9
(4, 9)
2007-07-13 23:27:54 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋
2x - 2(- 2x + 17) = - 10
2x + 4x - 34 = - 10
6x = 24
x = 4
y = - 8 + 17
y = 9
x = 4 , y = 9
2007-07-16 05:11:16 · answer #5 · answered by Como 7 · 0⤊ 0⤋
You are OK up to and including
2x -2(-2x + 17) = -10
but then you fouled up in distributing the -2. Your next step should be:
2x + 4x - 34 = -10
which you then solve for x to get
x = 4
You then substitute this newly-gotten value of x back into your equation
y = -2x + 17 to get
y = -2(4) + 17, or
y = 9
2007-07-13 22:53:23 · answer #6 · answered by devilsadvocate1728 6 · 0⤊ 0⤋
2x -2(-2x + 17) = -10
2x +4x - 34 = -10
6x-34=-10
6x-24=0
x=4
then if x=4,
2(4)-2y=-10
8-2y=-10
2y=18
y=9
So, x=4, y=9
help it can help u..the asw is 99% correct!!
2007-07-13 22:53:24 · answer #7 · answered by jacqueline 1 · 0⤊ 0⤋
watch sign multiplication
you should get 2x +4x -34 = -10
6x=-10+34=24
x=4
2007-07-13 22:45:24 · answer #8 · answered by 037 G 6 · 0⤊ 0⤋
you have to watch the signs and multiplication
2x -4x + 38 = -10
should be
2x + 4x - 34 = -10
6x-38=-10
6x=24
x=4
so y=-2(4)+17
y=9
2007-07-13 22:44:02 · answer #9 · answered by leo 6 · 0⤊ 0⤋