Linear And Quadratic Equations

Question 1

Whatever we perform on one side of an equation

Answer 1

We must also perform on the other side of the equation

Question 2

Two methods for solving a system of linear equations of two variables

Answer 2

The Substitution Method and the Combination Method

Question 3

Substitution Method

Answer 3

Isolate one of the two variables in either equation. Then insert the value of that variable into the other equation.

Question 4

Combination Method

Answer 4

Given a system of equations, we can add one equation to another equation or subtract one equation from another equation in order to eliminate one variable and solve for the other variable.

Question 5

3 quadratic identities that must be memorized

Answer 5

1) (x+y)^2=(x+y)(x+y)=x^2+y^2+2xy
2) (x-y)^2=(x-y)(x-y)=x^2+y^2-2xy
3) (x+y)(x-y)=x^2-y^2