Solve Equations by Graphing, Substitution, or Elimination

Solve by using substitution method.

• (2, 7)

• (0, 1)

• (2/5, 9/5)

• (2, 5)

Solve by using elimination method.

• (3, 1)

• ( 5, -5)

• (2, 5)

• (15, 1)

For equations below, which method is easier to use? Why?

• Graphing, because both are already in y = mx + b form.

• Substitution, because one equation is already solved for y. 

• Elimination, because both are already in ax + by = c form. 

• None. 

For equations below, which method is easier to use? Why?

• Graphing, because both are already in y = mx + b form.

• Substitution, because one equation is already solved for y. 

• Elimination, because both are already in ax + by = c form. 

• None. 

For equations below, which method is easier to use? Why?

• Graphing, because both are already in y = mx + b form.

• Substitution, because one equation is already solved for y. 

• Elimination, because both are already in ax + by = c form. 

• None. 

For equations below, which method is easier to use? Why?

• Graphing, because both are already in y = mx + b form. Also, substitution, because one equation is already solved for y. 

• Elimination, because both are already in ax + by = c form. 

• Elimination, because both are already in ax + by = c form. Also, graphing, because both are already in y = mx + b form. 

• None.

Write equations to find total amount of savings for Theresa and Cary.

• Theresa: y = 5x + 1
  Cary: y = x + 3

• Theresa: y = x + 5
  Cary: y = 3x + 1

• (2, -2)
• (2, 2)
• (-2, 2)
• (-2, -2)

• Infinitely Many Solutions
• No Solution

Which of these is NOT one of the methods I showed you for solving systems of linear equations?

• Elimination

• Substitution

• Graphing

• Frustration