Intro: Solving Systems by Substitution

What is the solution?

• (1, -1)
• (-1, 1)
• (0, -2)
• (2, 0)

This system has _____ solutions

• 0
• 1
• 2
• Infinitely many

Complete the solution to the system:

(6, ___)

2x + y = 21

y = 2x - 3

• (6, 6)

• (6, 9)

• (9, 6)

• (9, 9)

Complete the solution to the system:

(___, 10)

x = y - 6

3x - y = 2

• (10, 4)

• (16, 10)

• (10, 6)

• (4, 10)

Is the point (x,y) a solution to the system below?

y = 2x - 1

3x - y = 2

• Yes!

• No, it does not make the first equation true

• No, it does not make the second equation true

Solve the following systems of equations using substitution:

5x - 2y = 3

y = 2x

• (6, 3)

• (1, 2)

• (3, 6)

• (2, 1)