This video tutorial teaches how to solve systems of linear equations in two variables using the substitution method. It covers two examples: the first example demonstrates solving for X when X is already isolated, and the second example involves solving for Y in a more complex scenario. The video concludes with a brief mention of the elimination method as a next step.

What is the first step in solving systems of linear equations using the substitution method?

• Graph the equations

• Isolate one of the variables

• Add the equations together

• Multiply the equations by a constant

In the first example, what is the expression for x?

• x = y + 4

• x = 4 + y

• x = 4 - y

• x = y - 4

After substituting x = 4 + y into the other equation, what is the next step?

• Check the solution

• Graph the equation

• Solve for x

• Solve for y

What is the coordinate pair solution for the first example?

• (3, -1)

• (-1, 3)

• (1, -3)

• (-3, 1)

Why is the second example considered more challenging?

• It involves three variables

• Neither variable is isolated initially

• It involves complex numbers

• It requires graphing

In the second example, which variable is easier to solve for?

• The variable with the smaller coefficient

• The variable that appears only once

• The variable that appears in both equations

• The variable with the larger coefficient

What is the expression for y after solving the second equation?

• y = -1 + 3x

• y = 1 - 3x

• y = -1 - 3x

• y = 1 + 3x

What is the value of x in the second example after solving the equation?

• x = -1

• x = -2

• x = 1

• x = 2

What is the coordinate pair solution for the second example?

• (-1, 2)

• (-2, 1)

• (2, -1)

• (1, -2)

How can you verify the solution of a system of equations?

• By substituting the solution back into the original equations

• By graphing the equations

• By checking the solution with a calculator

• By solving the equations again