Question 634987
The graph you describe is the graph of:
{{{y = x^2-1}}}
This graph can be used to solve
{{{x^2-1 = 8}}}
because the two equations are the same except one has a y and the other has an 8. To solve the equation using the graph:<ul><li>Find the points where y = 8 on the graph. They form a horizontal line that passes through 8 on the y-axis.</li><li>Find where this horizontal line intersects the parabola. You should find two points, one to the right of the y-axis and one to the left.</li><li>The x-coordinates of these points are the solutions to your equation.