Question

The following equation shows the relation between the water requirement in gallons $\left(y\right)$ and time in years ($x$) in a city.
$4y=520x$
Find the rate of increase of water requirement.

• A. 100
• B. 120
• C. 140
• D. 130

Answer 1

The correct option is D 130

The given equation is $4y=520x$

$y=\frac{520}{4}x$

$\Rightarrow y=130x$
Now, the equation is of form $y=mx$, where $m$ is the slope.
Hence, increase in the requirement of water per year is 130 gallons.