6.4 Lesson

6.4 Lesson

What is being shown in the image?

Review Coordinate Grid

(x,y)

Find the x value on the x-axis, find the y value on the y-axis. Draw a dot where the two meet!

6.4 Writing Equations with Two Variables

• An equation with two variables represents two quantities that change in relationship to one anoher

• A solution of an equation in two variables is an ordered pair that makes the equation TRUE.

Multiple Choice

Tell whether the ordered pair is a solution of the equation.

y = 2x - 7; (6,5)

• YES

• NO

Multiple Choice

Tell whether the ordered pair is a solution of the equation.

y = 6x + 1; (2,11)

• YES

• NO

Graphing an Equation in Two Variables

• Make a table to find ordered pairs

• Pick numbers to substitute in for x

• Solve for y

• Write the solution as an ordered pair

• Plot the ordered pairs

• Draw a line through the points