### Home > A2C > Chapter 7 > Lesson 7.1.5 > Problem 7-80

7-80.

Find an equation for the parabola that passes through the points *6-81 HW eTool* (Desmos). Homework Help ✎

Create a system of three equations in three variables using the points and the equation .

Substitute the value for *c* into the first and third equations to simplify.

You now have a system of two equations with two variables to solve.

Use the eTool below to check your solution graphically.

Click the link at right for the full version of the eTool: *CCA2 6-81 HW eTool*