Question

If 3/x=7 and 4/y=12, then x-y=?

Answer 1

Answer:

x-y= $\frac{2}{21}$

Step-by-step explanation:

To find x, you divide 3 by 7.

i.e. $\frac{3}{x} = 7$

7x = 3

Divide both sides of the equation by 7

i.e. $\frac{7x}{7} = \frac{3}{7}$

x = $\frac{3}{7}$

To find y, you also divide 4 by 12.

i.e. $\frac{4}{y} = 12$

12y = 4

Divide both sides by 12.

i.e. $\frac{12y}{12} = \frac{4}{12}$

y = $\frac{1}{3}$

Therefore, x-y would be:

= $\frac{3}{7} - \frac{1}{3}$

Find the Lowest Common Multiple of 7 and 3 which is 21.

= $\frac{9-7}{21}$

= $\frac{2}{21}$

Hope this helps!!!