- 4 = 9y + 13 – 4y What is the solution of this equation?

Step-by-step explanation:

-4=9y+13-4y

combine like terms

9y-4y=5y

-4=5y+13

subtract 13 on both sides

-4-13=-17

-17=5y

divide both sides by 5

-17/5=y

since it cant reduce lower than that it stays like that.

hope this helps....

y = -17/5

Step-by-step explanation:

collect the like terms (-4 = 9y + 13 – 4y)

move the terms (-4 = 5y + 13)

calculate (-5y = 13 + 4)

divide both sides (-5y = 17)

so your solution is -17/5

can also be written as - 3 , or y = -3.4

- "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."