Substitution Review

Substitution Review

Here is a review over different substitution concepts.

Multiple Choice

Given the following equation, which variable should you use for substitution and in which equation?

 $5x\ +\ 3y=10$   $x=2y\ -3$  

• X in the FIRST equation

• Y in the FIRST equation

• X in the SECOND equation
  

• Y in the SECOND equation

Multiple Choice

Given the following equation, which variable should you use for substitution and in which equation?

 $y=-3x-11$   $4x\ +\ 2y\ =1$  

• X in the FIRST equation

• Y in the FIRST equation

• X in the SECOND equation
  

• Y in the SECOND equation

Multiple Choice

Given the following equation, which variable should you use for substitution and in which equation?

 $x=4+7y$   $5x-2y=0$  

• X in the FIRST equation

• Y in the FIRST equation

• X in the SECOND equation
  

• Y in the SECOND equation

Multiple Choice

Given the equation below, what should you do to solve the eqation for y?

 $-4x+y=10$  

• subtract 4x to both sides

• add 4x to both sides

• subtract 10 on both sides
  

• Equation is already solve for y

Multiple Choice

Given the equation below, what should you do to solve the eqation for y?

 $y-9x\ =\ -14$  

• subtract 9x to both sides

• add 14 to both sides

• subtract 14 on both sides
  

• add 9x on both sides

Multiple Choice

Given the equation below, what should you do to solve the eqation for x?

 $x+2y=10$  

• subtract x to both sides

• add 2y to both sides

• subtract 2y on both sides
  

• add x on both sides

Multiple Choice

Given the equation below, what should you do to solve the eqation for x?

 $x=10+3y$  

• subtract 10 to both sides

• add 3y to both sides

• subtract 3y on both sides
  

• the equation is already solved for

Multiple Choice

What should you work look like if you use y = 3x +2 and substitute it in for x + y = 10?

• x + 2 =10

• (3x + 2) + y = 10

• x + (3x + 2) = 10

• x + 3x = 10

Multiple Choice

What should you work look like if you use x = -4x + 1 and substitute it in for 3x - 2y = 4?

• (-4x - 1) - 2y =4

• (-4x + 1) - 2y = 4

• (-4x + 1) = 4

• 3x - 2(-4x + 1) = 4