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

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 = (r)/(p)`

The value of x be

`x = (r)/(p)`

Hence proved