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Need help with math homework?
I'm lost! I did most of my homework but this last part I'm just not getting it.
1.) y=3 / 7-x Solve for x
2.) y= 2x+1 / 3x-5 Solve for x
3.) mx+2a= 1/3(c-x) Solve for x
I have the answers but I'd really like to know how to do them.
2 Answers
- 1 decade agoFavorite Answer
1) y = 3/(7-x)
(7-x) y = 3
(7-x) = 3/y
-x = (3/y) - 7
x= 7- (3/y)
2) y= 2x+1 / 3x-5
3x-5 (y) = 2x +1
3xy-5y = 2x + 1
3xy-2x = 5y+1
x(3y-2) = 5y +1
x = (5y+1) / (3y-2)
3) mx+2a= 1/3(c-x)
mx + 2a = c/3 -x/3
mx + x/3 = c/3 - 2a
x (m+1/3) = c/3 - 2a
x = (c/3 - 2a) / (m+1/3)
Hope it helps
- 1 decade ago
1.) y=3/7-x
First, multiply by (7-x) so that you have y(7-x)=3
Second, divide by y so that you have 7-x=3/y
Third, subtract by 7 so that you have -x=(3/y)-7
Fourth, send the negative through(divide by -1) so that you have x=-(3/y)+7
Last, you can rewrite it so that x=7-3/y