Solving Equation with Substitution

Solve each system by substitution.

• A

• B

• C

• D

What is the first step in solving a system by Substitution?

• Make sure both equations are in standard form.

• Make sure at least one equation is solved for one variable.

• Make sure both equations are in slope-intercept form.

• Make sure both equations can be solved.

What is the solution to this equation?

• one solution

• no solution

• infinite solutions

• none of these

Which choice shows substitution correctly?

• 3x + (2x + 3) = 20

• 3x + 2y(2x + 3) = 20

• 3x + 2 (2x + 3) = 20

• y + 2x + 3 = 20

Solve each system by substitution.

• A

• B

• C

• D

Solve each system by substitution.

• A

• B

• C

• D

Solve each system by substitution.

• A

• B

• C

• D

Solve using substitution:

y = -6x + 5

-2x + y = 5

• (-3, -6)

• (-6, 3)

• (0, 5)

• (-3, 5)

Solve with substitution:

y = -2x + 18

y = 8

• (5, 8)

• (-5, 8)

• (2, 8)

• (-2, 8)

You can solve systems using these methods:

• graphing, substitution, and elimination

• rearranging, thinking, and guessing

• only by graphing