How to find X from 2y^2+6y=9x. And y^2-2y=3x?

Science & Mathematics by Anonymous 2018-05-25 11:03:30

Social Science

3 answers

Anonymous

2y^2 + 6y = 9x y^2 - 2y = 3x 3y^2 - 6y = 2y^2 + 6y y^2 - 12y = 0 y(y - 12) = 0 If y = 0, x = 0 If y = 12, x = 40
Anonymous

Make any variable the subject of the formula and substitute to the other
Anonymous

2y^2 + 6y = 9x. y^2 - 2y = 3x 2y^2 - 4y = 6x 10y = 3x y^2 - 2y = 10y y(y - 12) = 0 Solutions: y = 0 y = 12 If y = 0, x = 0 If y = 12, x = 40