How do I use algebra to find a graph's x-intercept? Precalculus Algebraic Modeling Solving Problems Algebraically and Graphically 1 Answer iceman Sep 26, 2015 y=f(x)=> To find the x-intercepts AKA roots/zeroes, set y to zero and solve for x. Answer link Related questions What does it mean to solve a problem algebraically? What is a sample problem to solve algebraically? What does it mean to solve a problem graphically? What is a sample problem to solve graphically? How do I find f(3) from the graph of f(x) = x^2 - 4x + 3? How do I find f(x) if its graph includes {(1, 5), (2, 8), (3, 11)}? How can I use a graph to write an algebraic function? Given vectors u=<4,1> & v=<1,3>, how would I determine the quantity 3u*-2v? How do you solve x^3 + 4x^2 - 20x = 80? How do you solve x^3 + 147 = 3x^2 + 49x? See all questions in Solving Problems Algebraically and Graphically Impact of this question 4050 views around the world You can reuse this answer Creative Commons License