Write an equation and use substitution to solve the following problem: kayla is saving $10 each week for a college fund. on her birthday, her aunt gave her $45 to add to the fund. if she has a total of $255 in the fund, determine how many weeks she has been saving. 1, 34 weeks 2, 15 weeks 3, 21 weeks 4, 12 weeks 5, none of the above

yes

yes yes yes

they can both be solutions depends on the equation

step-by-step explanation:

what is the equation? ?

- "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."