Substitution

Substitution

Remember that substitute means to replace something with something else.

Multiple Choice

If y=-3x+8 and x=7, what is going to be substituted in place of the x?

• 8

• 7

• 1

• -3

Multiple Choice

If 2y+x=9 and y=-4, what is going to be substituted in place of the y?

• 9

• -4

• 1

• 2

When using substitution to solve a linear system, you will often substitute an expression, not just a single number.

Multiple Choice

What is the expression that you can substitute for y?

• 4x

• -3

• -20

• -3x

Multiple Choice

What is the expression you can substitute for x?

• 3y+1

• 12

• 1

• 2x+4y

Multiple Choice

Choose the equation that shows how to use substitution to solve the system.

• x-(-2y)=9

• -2y-y=9

• x-y-2y=9

Multiple Choice

Choose the equation that shows how to use substitution to solve the system.

• -3(5x-7)-2y=-12

• -3x-2y+5x-7=-12

• -3x+5x-7=-12

• -3x-2(5x-7)=-12