Carol H. answered • 08/17/18

Tutor

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Masters' Degree in Mathematics with 35 Years of Teaching Experience

**Let y = the amount of money left in John's bank account**

**Let x = the number of the week**

**y = 486 - 18x**

**x y**

**1 468 y = 486 - 18 = 468**

**2 450 y = 486 - 18(2) = 450**

**3 432 y = 486 - 18(3) = 432**

**etc.**

**To find out when John will run out of money, let y = 0 and solve for x.**

**0 = 486 - 18x**

**-486 = -18x**

**27 weeks = x**