Question

Solve for x and y:
3/x=2/5
y/4=y-1/3

Answer 1

solve for x on top one

then plug it into bottom one.

Answer 2

Or you can use matrices. Set up augmented matrix and reduce to echelon form.

Answer 3

yea...how do u do that? lol

Answer 4

top equation is:\[\frac{3}{x}=\frac{2}{5}\]just cross multiply to find x.

Answer 5

is the bottom equation this?\[\frac{y}{4}=y-\frac{1}{3}\]

Answer 6

no its y-1 on top and 3 on bottom

Answer 7

so botton equation is:\[\frac{y}{4}=\frac{y-1}{3}\]again, just cross multiply and solve to find y

Answer 8

by cross multiply I mean this:

lets say you were given:\[\frac{a}{b}=\frac{c}{d}\]then you can say:\[a\times d=c\times b\]

Answer 9

so for x it would be 15 over 2 which equals 7.5?

Answer 10

It's called cross multiplication because of this diagram: