Which of the following statements describes a correct method for solving this equation? A.
Divide both sides of the equation by 5, and then subtract 3 from both sides.
B.
Subtract 2x from both sides of the equation, and then divide both sides by 3.
C.
Divide both sides of the equation by 5, and then add 3 to both sides.
D.
Add 2x to both sides of the equation, and then divide both sides by 3.

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Step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."