Pre-Calculus Chapter 4 Review

Which system has the following solution by graphing? The point of intersection is (-1,-3).

Tags

CCSS.8.EE.C.8B

What is the first step to eliminating a variable when solving systems using the elimination method?

• Plug-in an expression for its equivalent variable.

• Subtract the two equations to get one equation with two variables.

• Multiply one (or both) equations to get opposite values on the variable.

• Cross out the variable you are not solving for.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

• Infinitely Many Solutions

• No Solution

Tags

CCSS.8.EE.C.8B

When solving this system by elimination, which two equations would you add first?

• Equations 1 & 2

• Equations 1 & 3

• Equations 2 & 3

• You need to multiply the first equation by -1 before you can add anything.

Which two inequalities create the correct system for this graph?

• -1.7

• 2.1

• 3

• 0.2

What is the value in row 3 column 2 of C+D?

• -6

• -2

• -8

• 6

• -4

• 0

• 10

• 26

Find the value of row 2 column 1 of CA, if possible.

• -30

• 36

• 48

• 54

Create an augmented matrix of the system. Then use the rref function on the calculator to solve the system of equations.