How do you solve 2x+7y=15 and x=3-2y using substitution? Algebra Systems of Equations and Inequalities Systems Using Substitution 1 Answer Joseph W. Jun 4, 2016 y=3 Explanation: As x=3-2y, we can replace xin the other equation with this, turning it into 2(3-2y)+7y=15 which when expanded 6-4y+7y=15 6+3y=15 3y=9 y=3 Answer link Related questions How do you solve systems of equations using the substitution method? How do you check your solutions to a systems of equations using the substitution method? When is the substitution method easier to use? How do you know if a solution is "no solution" or "infinite" when using the substitution method? How do you solve y=-6x-3 and y=3 using the substitution method? How do you solve 12y-3x=-1 and x-4y=1 using the substitution method? Which method do you use to solve the system of equations y=1/4x-14 and y=19/8x+7? What are the 2 numbers if the sum is 70 and they differ by 11? How do you solve x+y=5 and 3x+y=15 using the substitution method? What is the point of intersection of the lines x+2y=4 and -x-3y=-7? See all questions in Systems Using Substitution Impact of this question 1725 views around the world You can reuse this answer Creative Commons License