Mackenzie spent $20 at the local farmer’s market. she bought b pounds of blueberries that cost $4 per pound, and r pounds of raspberries that cost $6 per pound. she wrote the equation 4b + 6r = 20 to represent the cost of all the fruit. which is equivalent to mackenzie’s equation?

i think it is D

Step-by-step explanation:

ON EDGE

- "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."