x and y both have exponents of 1. x and y are not multiplied together.

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Presentation transcript:

x and y both have exponents of 1. x and y are not multiplied together. Notice that when a linear equation is written in standard form x and y both have exponents of 1. x and y are not multiplied together. x and y do not appear in denominators, exponents, or radical signs. A, B, or C cannot be a fraction. The leading coefficient (A) cannot be negative.

Rewriting Equations in Standard Form Rewrite the equation in standard form.

Rewriting Equations in Standard Form Rewrite the equation in standard form. Multiply both sides by 12, to clear the fraction. 3x = 24 – 4y +4y +4y Write the equation in standard form. 4y + 3x = 24

Graphing Linear Equations by Using Intercepts, After Writing in Standard Form Use intercepts to graph the line described by the equation. y = –x + 4

Application The school sells pens for $2.00 and notebooks for $3.00. The equation 2x + 3y = 60 describes the number of pens x and notebooks y that you can buy for $60. Graph the function and find its intercepts. 2x + 3y = 60 Find the intercepts. x-intercept: y-intercept: 2x + 3y = 60 2x + 0 = 60 2x + 3y = 60 0 + 3y = 60 3y = 60 2x = 60 x = 30 y = 20 x-intercept: 30; y-intercept: 20

Application The school sells pens for $2.00 and notebooks for $3.00. The equation 2x + 3y = 60 describes the number of pens x and notebooks y that you can buy for $60. What does each intercept represent? x-intercept: 30. This is the number of pens that can be purchased if no notebooks are purchased. y-intercept: 20. This is the number of notebooks that can be purchased if no pens are purchased.