478,275 views
20 votes
20 votes
A) what is the rate that jim is saving per week?B) What is the rate josh is saving per week?C) who is correct

A) what is the rate that jim is saving per week?B) What is the rate josh is saving-example-1
User Tomas Trdla
by
3.1k points

1 Answer

16 votes
16 votes

Notice that they give us the actual linear equation that represents the savings of Jim for week:

y = 120 x + 250

The rate here is given by the "slope"of this linear equation (the slope is the numerical factor that multiplies the variable "x" of the number of weeks).

Then the RATE of savings per week for Jim is: $120 per week.

Now, we need to obtain the rate for Josh based on the values given in the table. We use for example:

2 weeks --> $520

4 weeks --> $740

and we calculate the rate using the slope formula:

rate per week for Josh = (740 - 520) / (4 - 2) = 220 / 2 = $110 per week.

Then, Vivian is right (Jim is saving at a higher rate)

User Alex Povar
by
3.0k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.