Substitution vs Graphing

• Infinite number of solutions

• (0, 7)

• (-5, -7)

• (5, 7)

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

What are the steps to solve a system of equations by substitution?

• Graph both lines, solve for y, find the intersection

• Solve one equation for x or y, plug it into the other equation and solve, plug result into first equation and solve

• Solve both equations for y, graph both lines, find the intersection

• Solve both equations for y, set them equal to each other, solve for x

Which method would you use to solve the system of equations?

• graphing

• substitution

• elimination

What is the solution to this system of equations? Solve by substitution or graphing.

• (7, -8)

• (-7, 8)

• (-7, -8)

• (7, 8)

Which method would you use to solve the system of equations?

• graphing

• substitution

• elimination

At how many minutes would their cost be equal?

• 10

• 20

• 30

• 40

Which method would be best (quickest) for solving the system below:
3x - 4y = -2
y = 2x + 1

• Substitution

• Elimination

• Graphing

• None

The first step in solving using the substitution method is __________.

• get x by itself

• get y by itself

• get either variable by itself

• add the equations together

How many solutions will this system have?

• One

• Two

• No Solution

• Infinitely Many Solutions