How do i solve....
1. 3x+5y=7
2. 2x=-3y+10
3. 1+7y=5x-2
4. 9-y=1.5x
How do i do these and show all work thanks HELP Due Tommorow need to figure out these things
2007-10-24 11:12:52 · 4 answers · asked by *Kirby* 5 in Science & Mathematics ➔ Mathematics
Simplify then whatever I just need someone to answer them and tell me the steps
2007-10-24 11:23:12 · update #1
3x + 5y = 7
x = 0
3(0) + 5y = 7
0 + 5y = 7
5y = 7
Divide both sides of the equation by 5
5y / 5 = 7 / 5
y = 7/5
y = 1 2/5
- - - - - - - -
3x + 5y = 7
y = 0
3x + 5(0) = 7
3x + 0 = 7
3x = 7
Divide both sides of the equation by 3
3x / 3 = 7 / 3
y = 7/3
y = 2 1/3
- - - - - - - - -s-
2007-10-24 11:23:15 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
1.- 3x + 5y = 7 3x = (-5y + 7)
(5y - 7) + 5y = 0
10y = 7
y = 7/10 = 0.7
(0.7)(5y) = 3.5
(7 - 3.5 ) = 3.5
3.5/(3x) = 7/6
7/6 = 1.166666667
x= 1.166666667
y = 0.7
2.- 2x = (-3y + 10) = 2x + 3y = 10
(3y-10) + 3y = 0
6y = 10
y = 10/6 = 1.666666667
1.666666667(3y) = 5
10 - 5 = 5
5/(2) = 2.5
x = 2.5
3.- 1 +7y = 5x -2 = (3 = 5x - 7y) = -5x + 7y = -3
-5x = (-7y-3)
(7y+3) + 7y =0
14y = -3
y = -0.2143
x = 0.29998
-0.2143(7y)+1 = -0.5001
0.29998(5x) - 2 = -0.5001
4.- 9 - y = 1.5x = -1,5x = (y - 9)
(-y+9)+(-y) = 0
-2y = -9
y = 4.5 = 9 - (4.5) = 4.5
x = 3 = 3 *(1.5) = 4.5
2007-10-24 19:54:43 · answer #2 · answered by Eduardo (lalo) Leal 2 · 0⤊ 0⤋
simplify them not solve them
2007-10-24 18:21:46 · answer #3 · answered by Chelsea 2 · 0⤊ 0⤋
you can't solve...you simplify
2007-10-24 18:16:33 · answer #4 · answered by Anonymous · 0⤊ 0⤋