A commuter has $345 in his commuter savings account. This account changes by -$15 each week he buys a ticket. In one time period, the account changed by -$240.
a. For how many weeks did the commuter buy tickets?

b. How much must he add to his account if he wants to have 20 weeks’ worth of tickets in his account?

A.16 weeks

B. $195

Step-by-step explanation:

A.

345-15x=345-240

345-15x=105

15x=240

x=16

B.

345-240=105

20x15=300

105+x=300

x=195

f(x) is the value of the function. b is the value of the function when x equals zero or the y-coordinate of the point where the line crosses the y-axis in the coordinate plane.

step-by-step explanation:

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