x^2+18=9x but i have to solve by graphing and its a quadratic so like omg im so comfused

x^2 + 18 is the graph of x^2 shifted up 18 units on the y axis.

9x is a line going through the origin with a slope of 9

Here's a graph of both..........https://www.desmos.com/calculator/nyjmqpe4au

Notice that there are two intersection points

Hint: Make sure your equation is set equal to zero and make sure your terms are in descending order