Question

Observe the graph given below:


The unit rate at which the temperature is increasing for Metal 1 is the increase for Metal 2.

• A. greater than
• B. less than
• C. equal to

Answer 1

The correct option is B less than

For Metal 1:


Observe the points (1, 3) , (5, 5) on line representing Metal 1.

$\text{∴ Unit rate for Metal 1 =}\frac{changeiny}{changeinx}$
$=\frac{5-3}{5-1}$
$=0.5K/h$

For Metal 2:


Observe the points (1,7) , (3,9) on line representing Metal 2.

$\text{∴ Unit rate for Metal 2 =}\frac{changeiny}{changeinx}$
$=\frac{9-7}{3-1}$
$=1K/h$

So, unit rate of Metal 1 is less than that of Metal 2.