Solving Systems of Equations by Substitution

What is the primary method discussed for solving systems of linear equations in the video?

• Substitution method

• Elimination method

• Matrix method

• Graphical method

In the first example, if y = x + 3 and y = 5x, what is the value of x?

• 1

• 3

• 5

• 0

Using the first example, what is the value of y when x = 1?

• 5

• 2

• 8

• 4

In the second example, what substitution is made for y in the equation 5x - 2y = 10?

• 3x - 4

• 5x

• 3x + 4

• 2x + 3

What is the solution for x in the equation 5x - 6x + 8 = 10?

• 1

• -2

• 0

• 2

In the third example, what is the value of y when x = 5y + 3?

• 1/2

• -1/2

• 1

• 0

What is the final value of x in the third example?

• -1/2

• 0

• 1/2

• 1

In the real-world application, how many 45 pound plates are used?

• 10

• 8

• 4

• 12

How many 10 pound plates are used in the weight plates example?

• 4

• 8

• 12

• 10

What is the total weight added by the plates in the real-world example?

• 260 pounds

• 120 pounds

• 200 pounds

• 180 pounds