Question

Joy and Cullen put some money into their money boxes every week. The amount of money (y), in dollars, in their money boxes after a certain amount of time (x), in weeks, is shown by the equations below:

Joy: y = 30x + 20
Cullen: y = 20x + 90

After how many weeks will Joy and Cullen have the same amount of money in their money boxes, and what is that amount?



6 weeks, $150
230 weeks, $7
7 weeks, $150
7 weeks, $230

Answer 1

7 weeks, $230

Explanation:

i just took the test

Answer 2

The answer would be D. 7 weeks, $230.

Explanation: y would be the total amount after x weeks. So, to find the answer, simply go through your choices and insert x and y. Both y's for Joy and Cullen have to match up for the answer to be correct.

For answer D, it looks like:

Joy: 30(7) + 20 = 230
Cullen: 20(7) + 90 = 230