How do you solve x2+y2=153,y=−4x? Precalculus Solving Systems of Two Equations Solving by Substitution 1 Answer ali ergin Dec 10, 2016 x={−3,+3} Explanation: x2+y2=153 y=−4x (y2)=(−4)2 (y)2=16x2 x2+16x2=153 17x2=153 x2=15317 x2=9 x={−3,+3} Answer link Related questions What is a system of equations? What does it mean to solve a system of equations by substitution? How do I use substitution to find the solution of the system of equations c+3d=8 and c=4d−6? How do you write a system of linear equations in two variables? How does a system of linear equations have no solution? How many solutions can a system of linear equations have? What is the final step of completing a solve by substitution problem? How do I use substitution to find the solution of the system of equations 4x+3y=7 and 3x+5y=8? How do I use substitution to find the solution of the system of equations y=2x+1 and 2y=4x+2? How do I use substitution to find the solution of the system of equations y=13x+73 and... See all questions in Solving by Substitution Impact of this question 7159 views around the world You can reuse this answer Creative Commons License