Question #6f64b Algebra Quadratic Equations and Functions Comparing Methods for Solving Quadratics 1 Answer Eddie Mar 27, 2017 See below Explanation: #2x + y = 0 implies y = - 2x# And next: #5x^2 + y^2 = 9 implies 5x^2 + (-2x)^2 = 9 # # implies 9x^2 = 9 implies x = pm 1# # implies y = pm 2# Answer link Related questions What are the different methods for solving quadratic equations? What would be the best method to solve #-3x^2+12x+1=0#? How do you solve #-4x^2+4x=9#? What are the two numbers if the product of two consecutive integers is 72? Which method do you use to solve the quadratic equation #81x^2+1=0#? How do you solve #-4x^2+4000x=0#? How do you solve for x in #x^2-6x+4=0#? How do you solve #x^2-6x-16=0# by factoring? How do you solve by factoring and using the principle of zero products #x^2 + 7x + 6 = 0#? How do you solve #x^2=2x#? See all questions in Comparing Methods for Solving Quadratics Impact of this question 910 views around the world You can reuse this answer Creative Commons License