If 25y = 8x and 125y = 4x - 1, then the value of x is

Question

anonymous · Answer

use substitution
so x= 25/8y

then plug that into the other equation
125y = 4(25/8y) - 1

anonymous · Answer

er
x = 25y/8

then
125y = 4(25y/8)-1

anonymous · Answer

that will give you y.. do vice versa to figure out x

anonymous · Answer

Solve them both for y:$$y=\frac{8x}{25}$$$$y=\frac{4x-1}{125}$$
Now that they're both equal to y (and because we know these two equations are talking about the same x and y) you can substitute y for the other equation:$$\frac{8x}{25} = \frac{4x-1}{125}$$Then solve for x:$$(125)(8x) = (4x-1)(25)$$$$1000x = 100x-25$$$$900x = -25$$$$x = -\frac{25}{900} = 0.02777$$

anonymous · Answer

alexray, any ideas on my problems?

anonymous · Answer

used to know how to do your physics problems but it's been a few years

anonymous · Answer

What do you mean? What physics problems?

anonymous · Answer

oh whops, ment feldy. he was looking at it earlier and he had a question about stars orbiting etc. never mind