Add/Subtract Elimination

What is the first step in solving a system of equations by elimination/matrices?

• Get both equations in standard form and line up the like terms.

• Get both equations in slope-intercept form.

• Get both equations equal to zero.

• Put the x terms first.

The solution (x, y) to a system of equations is the point where they...? 

• Run off the graph

• Don't touch

• Intersect

• Exist

Solve using elimination.
7x + 2y = 24
8x + 2y = 30

• (6,-9)

• (-9,6)

• No solution

• Infinite number of solutions

a method to solving a system of equations by getting rid of one of the variables first to solve for the other variable. 

• Systems by Graphing

• Systems by Substitution

• Systems by Elimination

• Systems by Drawing

5x - y = 12

3x + y = 4

which variable should be "eliminated" first?

• x

• y

6x + 7y = -15

6x - 2y = 12

which variable should be "eliminated" first?

• x

• y

Solve the following using elimination.
x − y = 11
2x + y = 19

• (-1, 10)

• (30, 19)

• (19, 30)

• (10, -1)

In order to "Eliminate" one of the variables, which operation would you use?

• Addition

• Subtraction

In order to "Eliminate" one of the variables, which operation would you use?

• Addition

• Subtraction

In order to "Eliminate" one of the variables, which operation would you use?

• Addition

• Subtraction