4x -5y = 2
3x +2y = 13
The sum of x and y is 5, but u must show the following steps..;o)
2007-12-06 05:52:35 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
8x - 10y = 4
15x + 10y = 65-----ADD
23x = 69
x = 3
9 + 2y = 13
2y = 4
y = 2
x = 3 , y = 2
2007-12-06 10:00:42 · answer #1 · answered by Como 7 · 2⤊ 0⤋
I multiplied the top equation by 3 to get 12x - 15y = 6.
I multiplied the bottom equation by -4 to get -12x - 8y = -52.
Add them together and the x's cancel out; solve for y...y = 2.
Substitute y = 2 to solve for x...x = 3.
2007-12-06 05:58:44 · answer #2 · answered by WT 4 · 0⤊ 0⤋
Multiply the top one by 2, and the bottom one by 5.
Then add the equations together.
2007-12-06 05:56:10 · answer #3 · answered by za 7 · 0⤊ 1⤋
4x - 5y = 2 multiply by 3
12x - 15y = 6
3x +2y = 13 multiply by 4
12x + 8y = 52
Subtract equations
12x - 15y = 6
-(12x + 8y = 52)
--------------------
-23y = -46
y = 2
4x - 5*2 = 2
4x = 12
x = 3
2007-12-06 05:58:45 · answer #4 · answered by DWRead 7 · 0⤊ 0⤋
2y+3x = 13
2y=13-3x
y=6.5-1.5x
4x-5y = 2
4x-5(6.5-1.5x) = 2
4x-32.5+7.5x = 2
11.5x = 34.5
x=3
x = 3
3x + 2y = 13
3(3) +2y = 13
2y = 4
y=2
Check it-
4(3) - 5(2) = 2?
12-10=2
Checked.
2007-12-06 06:00:57 · answer #5 · answered by Jonathan J 2 · 0⤊ 1⤋
x=3
y=2
2007-12-06 05:59:13 · answer #6 · answered by Mweep C 2 · 0⤊ 0⤋
got my two points. no i'm just kiddin.
If you have a TI83, put it in as a matrix and it will find the x and y values as the answer to the matrices.
2007-12-06 05:55:59 · answer #7 · answered by Anonymous · 0⤊ 1⤋