2006-08-04 08:33:20 · 8 answers · asked by hop along casidy 2 in Education & Reference ➔ Homework Help
OK....You have two unknown......x and y......What you need to do is to find a mathematical relation between the 2 of them
Say you take .... 2x - 3y = 8 - 2x.....and you take all x terms in left and all the others in the right (remember when you put one term from one side to the other, its sign changes).....you get:
2x + 2x = 8 +3y
4x = 8 +3y
x = (8 + 3y) / 4
Now you take 3x + 4y = x + 3y +14......and instead of x you put....(8 + 3y) / 4.....you get:
3[(8 + 3y) / 4] + 4y = (8 + 3y) / 4 + 3y +14
6 + 9y/4 + 4y = 2 + 3y/4 +3y +14
From here you find out y= 4
If you remember (if not, see above).......x = (8 + 3y) / 4
So x= 5
2006-08-04 11:09:08 · answer #1 · answered by Delfina 3 · 1⤊ 0⤋
the system of equations is
2x-3y=8-2x
3x+4y=x+3y+14
Now rearrange the tems.variables in one side constants on other side make sure u change the sign when transfering a term to the other side
ie. 4x-3y=8
2x+y=14
Multiply the second equation by3 in orde to make the y coefficients(no problem for sign) same in both the equations.noe the system becomes
4x-3y=8
6x+3y=42
add both the equations
10x=50
there fore x=50/10=5
substitute this value of x in any equation and u will get the value of y also (y=4)
2006-08-04 08:51:39 · answer #2 · answered by math 2 · 0⤊ 0⤋
First answer...
-3y=8 (+plus 2x)
y= -8/3 (divide by -3)
Second answer....
2x+y=14 (-x and -3y)
2006-08-04 08:41:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Change the first equation to 4x-3y = 8
Change the second equation to 2x+y=14
Multiply the second equation by 2: 4x +2y =28
Take the first equation MINUS the third one. -5y=-20
Solve that: y = 4
Substituting x = 5
I set this up as a SUBTRACTION SYSTEM as you asked
2006-08-04 10:59:53 · answer #4 · answered by MollyMAM 6 · 0⤊ 0⤋
2x - 3y = 7 -3x + y = 7 of the form Ax + by using = C Dx + Ey = F answer IS x = ( (C * E) - (B * F) ) / ( (A * E) - (B * D) ) x = ( (7 * a million) - (-3 * 7) ) / ( (2 * a million) - (-3 * -3) ) x = -4 y = ( (A * F) - (C * D) ) / ( (A * E) - (B * D) ) y = ( (2 * 7) - (7 * -3) ) / ( (2 * a million) - (-3 * -3) ) y = -5 the answer is: (-4 , -5)
2016-12-11 03:07:23 · answer #5 · answered by ? 4 · 0⤊ 0⤋
2x-3y=8-2x
2x+2x-3y=8
4x-3y=8
3x+4y=x+3y+14
3x-x+4y-3y=14
2x+4=14
2006-08-04 11:55:51 · answer #6 · answered by piyo006 3 · 0⤊ 0⤋
Hmmm you should do your own homework ...its better in the long run ...lol
2006-08-04 08:42:50 · answer #7 · answered by Anonymous · 0⤊ 0⤋
You learn from your mistakes, just fail it.
2006-08-04 08:46:08 · answer #8 · answered by A 3 · 0⤊ 0⤋