Understanding Systems of Linear Equations

The video tutorial explains how to solve a system of linear equations by graphing. It begins with an introduction to the method, highlighting that the solution is the intersection of the graphs. The tutorial then demonstrates graphing the horizontal line y = 5 and the vertical line x = 3. Finally, it identifies the intersection point (3, 5) as the solution to the system, emphasizing the simplicity of the process when equations are in the form y = constant and x = constant.

What is the first step in solving a system of linear equations by graphing?

• Find the determinant of the system.

• Use substitution to find the solution.

• Graph both equations on the same coordinate plane.

• Solve each equation algebraically.

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CCSS.8.EE.C.8A

Why is the solution to the system of equations obvious in this case?

• Both equations have the same slope.

• The equations are parallel.

• The equations are in standard form.

• One equation contains only y and the other only x.

What type of line does the equation y = 5 represent?

• A diagonal line

• A horizontal line

• A curved line

• A vertical line

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CCSS.HSF.IF.A.1

Which of the following points lies on the line y = 5?

• (5, 5)

• (0, 0)

• (5, 3)

• (3, 5)

What is the x-coordinate of every point on the line x = 3?

• 0

• 1

• 3

• 5

Which of the following points is a solution to the equation x = 3?

• (0, 3)

• (3, 0)

• (0, 0)

• (3, 3)

What is the point of intersection of the lines y = 5 and x = 3?

• (5, 3)

• (1, 1)

• (3, 5)

• (0, 0)

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CCSS.8.EE.C.8B

Why is the point (3, 5) the solution to the system of equations?

• It is the midpoint of the lines.

• It is the point where the lines intersect.

• It is the only point on both lines.

• It is the average of the intercepts.

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CCSS.8.EE.C.8B

What does the intersection point of two lines on a graph represent?

• The sum of the intercepts

• The solution to the system of equations

• The average slope of the lines

• The midpoint of the lines

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CCSS.8.EE.C.8B

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

• By ensuring both lines have the same y-intercept

• By checking if the lines are parallel

• By finding the intersection point of the lines

• By calculating the slope of each line

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CCSS.8.EE.C.8B