Question

px + qy = r
2px - qy = 2r
When solving this system of equations, x =



A.p/r

B.r/p

C.3r/2p

Answer 1

Little too late I'm sure...however

\[\large px + qy = r\]
\[\large 2px - qy = 2r\]

When you add these 2 equations...the +qy and -qy cancel out...so

\[\large 3px = 3r\]

Then you just divide both sides by 30 to isolate x

\[\large x = \frac{r}{p}\]

Hope that helps _