hey i have a math question that i cant solve.. help..!!
7(5x + 5y) = 105..
and it say the answer is :
y = 3-x
find the y??
2007-02-21 00:32:59 · 8 answers · asked by You think you know me? 6 in Science & Mathematics ➔ Mathematics
7(5x + 5y) = 105
35x + 35y = 105
35x + 35y - 35x = - 35x + 105
35y = - 35x + 105
35y/35 = - 35x/35 + 105/35
y = - x + 3
The answer y = - x + 3
- - - - - - - - -s-
2007-02-21 06:42:54 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
7(5x + 5y) = 105
divide both sides by 7
5x + 5y = 15
divide both sides by 5
x + y = 3
y = 3 - x
That's as far as you can go unless you have values for either x or y. (If you do, put those into the equation and solve for the other variable.)
2007-02-21 08:37:19 · answer #2 · answered by Mathematica 7 · 0⤊ 0⤋
7(5x+5y)=105
=>7*5(x+y)=105
=>x+y=105/7*5=3
=>y=3-x
2007-02-21 08:39:28 · answer #3 · answered by alpha 7 · 0⤊ 0⤋
Because when you factor out the 5 thats in the parenthesis, your left with 7x5(x +y) = 105, which is equal to 35(x+y)=105. Divide by 35 and your left with x+y = 3....so subtract x from both sides and your left with y = x-3
2007-02-21 08:43:30 · answer #4 · answered by ranger752555 2 · 0⤊ 0⤋
7(5x + 5y) = 105
Divide both sides by 7
5x + 5y = 15
Divide both sides by 5
x + y = 3
Subtract x from both sides
y = 3 - x
2007-02-21 08:45:43 · answer #5 · answered by nospamcwt 5 · 0⤊ 0⤋
7(5x + 5y) = 105
5x + 5y = 15
x + y = 3
y = 3 - x
2007-02-21 08:38:09 · answer #6 · answered by Anonymous · 0⤊ 0⤋
we can find that y=3-x and if the answer is this this a line and have more than one answer so you can say the exact answer forexample if yo put x = 3 -> y=0 and it is true and if you put x = 1 -> y = 2 and it is true too.
2007-02-21 08:57:28 · answer #7 · answered by hbj 2 · 0⤊ 0⤋
you would need two different equations to solve two unknowns
2007-02-21 08:37:24 · answer #8 · answered by pigley 4 · 0⤊ 0⤋