Question

Compare the amount of oxygen consumed by two astronauts.

On observing, the value of,
Slope of red line - Slope of blue line is .

• A. 2.8
• B. -1
• C. 0
• D. -2

Answer 1

The correct option is A 2.8

The graph shows the straight lines representing the amount of oxygen consumed by two astronauts.

For the red-colored line:

Let us consider two points (0,0), and (5,7).

$\text{Slope}=\frac{\Delta y}{\Delta x}$
$=\frac{(7-0)}{5-0}$
$=\frac{\left(7\right)}{5}$
$=1.4$

For the blue-colored line:

Let us consider two points on the blue line (0,0), and (-3,4.2)

$\text{Slope}=\frac{\Delta y}{\Delta x}$
$=\frac{(4.2-0)}{-3-0}$
$=\frac{\left(4.2\right)}{-3}$
$=-1.4$

So, we get,
Slope of red-colored line = 1.4
Slope of blue-colored line = -1.4

∴ The value of
Slope of red line $-$ Slope of blue line
$=1.4-(-1.4)=1.4+1.4=2.8$