Solve the system of… - QuestionCove
OpenStudy (anonymous):

Solve the system of equations using the substitution method. 1. y=x^2+2x-1 y=-2x-4 2. y=2x^2-5 y=11-4x

2 years ago
OpenStudy (solomonzelman):

for the first problem. you are given (in the second equation) that $$\large\color{black}{ \displaystyle y }$$ is same thing as $$\large\color{black}{ \displaystyle -2x-4 }$$ So, all you need to do is to substitute this (the -2x-4 ) instead of y into the first equation.

2 years ago
OpenStudy (anonymous):

oh ok thank you that makes more sense

2 years ago
OpenStudy (solomonzelman):

the substitution will occur the following way: YOUR FIRST EQUATION $$\large\color{black}{ \displaystyle \color{red}{y}=x^2+2x-1 }$$ SUBSTITUTION $$\large\color{black}{ \displaystyle \color{red}{-2x-4}=x^2+2x-1 }$$

2 years ago
OpenStudy (solomonzelman):

(I am lagging, excuse me)

2 years ago
OpenStudy (solomonzelman):

simplify and factor.

2 years ago