Unit 4 Review (8th Grade)

Solve for x and y
y = 2x + 1
y = 4x - 1

• (1,3)
• (-1,-3)
• (-1,3)
• (3,1)

Solve the system given:
3x - y = 7
2x + y = 3

• (-1,2)
• (5,4)
• (4,5)
• (2,-1)

What is the solution to the system?

• (3, -1)
• (2, -6)
• No Solution 
• (6, -2)

What is the solution to the system?

• (0, 3)
• (1, -1)
• (-3, 1)
• (1, 3)

 Is (8,5) a solution to the system of equations?

 $5x-4y=20$  

 $3y=2x+1$  

• Yes 

• No 

Solve the system of equations with substitution.

 $x=-3$  
 $2x+3y=6$  

• (7, -3)

• (-3, 4)

• (4, -3)

• (-3, 7)

If a system of equations has no solution, what does the graph look like? 

• intersecting lines
• parallel lines
• skew lines
• intersecting lines

The first step in solving using the substitution method is __________.

• get x by itself
• get y by itself
• get either variable by itself
• add the equations together

Parallel Lines never intersect because...

• they have the same slopes. 
• they have the same y-intercept.
• they have different slopes.
• they have different y-intercepts. 

What is the best method to use?

−4x − 2y = −12

4x + 8y = −24

• Graphing

• Substitution because a variable is defined

• Elimination because the equations are in standard form.