### Home > CC4 > Chapter 7 > Lesson 7.1.7 > Problem 7-82

7-82.

### Missing problem for Book Int1 => Chapter Ch7 => Lesson 7.1.7 => Problem 7-82

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Use a system of equations (2 equations), where *x* = number of months and *y* = weight in kg.

When writing the equations use slope-intercept form

(*y* = *mx* + *b*). Where *m* is the rate of change and *b* is the starting weight.

Equation for Apollo is *y* = 2*x* + 75.

Equation for Zeus is *y* = -3*x* +120.

Use the equal values method to solve the system.

So 2*x* + 75 = -3*x* + 120. Solve for *x*.

*x* = 11 months