SOLUTION: 2. x+3y=-9 Question: Add -9 to both sides of Equation. Do this by adding -9 to the right side, and x+3y (Which equals -9) to the left side. The resulting equation should have onl

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: 2. x+3y=-9 Question: Add -9 to both sides of Equation. Do this by adding -9 to the right side, and x+3y (Which equals -9) to the left side. The resulting equation should have onl      Log On


   

Question 59460This question is from textbook Algebra and Trigonometry
: 2. x+3y=-9 Question: Add -9 to both sides of Equation. Do this by adding -9 to the right side, and x+3y (Which equals -9) to the left side. The resulting equation should have only x as the variable. The y should have been eliminated. This question is from textbook Algebra and Trigonometry

Answer by pvaka(23) About Me  (Show Source):
You can put this solution on YOUR website!
Use the substitution methods to solve for y and then subtiture the result in the original equation.
Step1. Solve for y
x+3y=-9
x+3y-x=-9-x
3y/3=-x/3-9/3
y=-1/3x-3
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Step2.===>now subtitute (-1/3x-3) for y in x + 3y = -9
x +3(-1/3x-3) =-9
x -3(x+9/3) =-9
x - x-9 = -9
-9 = -9
x= any real numbers (infinite number of solution)
Pvaka