Question

px + qy = r
2px - qy = 2r
When solving this system of equations, x =?
p/r
r/p
3r/2p

Answer 1

Px + qy = r
2px-qy=2r
3px =3r 
x=3r/3p=r/p 
x=r/p
option B is correct
hope this helps

Answer 2

Answer

Find out the value of x .

To prove

As given

px + qy = r  and px + qy = r  

Multiply px + qy = r  by 2 and subtracted  with 2px - qy = 2r .

2px -2px + 2qy - qy = 2r - 2r

0 + qy = 0

y = 0

Put in the  px + qy = r  

px + 0 = r

px = r

$x = \frac{r}{p}$

The value of x be

$x = \frac{r}{p}$

Hence proved