simultaneous Equation, i have the answers but cannot seem to get to them

Hi all,

I have the following equations;

0 = A - (B/(50^2))

-8 = A - (B/(75^2))

with the answers as follows;

B = -36000

A = -14.4

I think i may be failing somewhere with my rearranging of the formulas to subtract one from the other.

Any ideas?

Re: simultaneous Equation, i have the answers but cannot seem to get to them

Quote:

Originally Posted by

**moleman87** Hi all,

I have the following equations;

0 = A - (B/(50^2))

-8 = A - (B/(75^2))

Rewrite them as:

$\displaystyle 50^2A - B=0$

$\displaystyle 75^2A -B= -8\cdot 75^2$

Re: simultaneous Equation, i have the answers but cannot seem to get to them

Quote:

Originally Posted by

**moleman87** Hi all,

I have the following equations;

0 = A - (B/(50^2))

-8 = A - (B/(75^2))

What do you get if you subtract the second equation from the first?

0- (-8)= 8, of course, and A- A= 0. So what is -B/50^2- (-B/75^2)? (50= 25(2) and 75= 25(3). So 50^2= 25^2(4) while 75^2= 25^2(9). The common denominator is 25^2(4)(9).

with the answers as follows;

B = -36000

A = -14.4

I think i may be failing somewhere with my rearranging of the formulas to subtract one from the other.

Any ideas?[/QUOTE]