5-3 System of equations review

What is the solution?

• (1, -1)
• (-1, 1)
• (0, -2)
• (0, 1)

How many solutions will this system have? 

• No solution
• One Solution
• I Don't Know
• Infinitely Many Solutions

If a system of equations has infinitely many solutions, what does the graph look like? 

• intersecting lines
• parallel lines
• skew lines
• the same line (coinciding lines)

HOW is a coordinate pair ordered?

• (big number, small number)

• (small number, big number)

• (y, x)

• (x, y)

A ________________ are two or more equations that have the same variables and work together.

• graphing lines

• elimination method

• system of equations

• table

Solve using Elimination. What is the first step to solve for y?
 4x + 8y =  20
-4x + 2y = -30

• Add equations together

• Multiply bottom equation by 4

• divide top equation by 4

Solve using elimination. What is the first step?
−4x − 4y = 0
  8x + 8y = 0 

• add equations together

• Multiply top equation by 2

• divide bottom equation by 8

What would be the first step in finding the solution with elimination?

4x + 3y = 1

x - 3y = -11

• add equations together which will eliminate y variable

• subtract equations which will eliminate the x variable

• change all the signs of the second equation

Identify the solution to this system of equations.

• (4, -1)
• (-1, 4)
• (-4, 1)
• (-4, -1)

Which variable will be eliminated?

• x

• y