Point Slope Form 4.3

Slope Intercept Form  If we want to write an equation in slope intercept form, we can start with point slope form and solve for y.

Example  Write the equation of the line which has a slope of 2 and passes through the point (4, -3) in slope intercept form.

Use point slope form to write the equation in slope intercept form  Through (2, 9) ; m = -2

Use point slope form to write the equation in slope intercept form  Through (-3, -1) ; m = 2/3

Use point slope form to write the equation in slope intercept form  Through (3, 4) and (5, 8)

Use point slope form to write the equation is slope intercept form  Through (-3, 1) and (4, -3)

Example  : The cost of sending a 1-ounce letter through the US mail is $0.49. Each additional ounce costs $0.22. Write an equation that gives the cost of sending a letter through the US mail as a function of its weight.

Example  Mrs. Crabb wants to order some new shirts on sale from Lands End. The cost of each shirt is $ She will also have to pay a shipping fee. If Mrs. Crabb orders 3 shirts, the total cost will be $ Write an equation that gives the total cost of her order as a function of the number of shirts ordered.

Can the table be modeled by a linear equation? If so write the equation in point slope form

Homework  Pg #31-34 all, 37, 41, 43 and the 4 additional problems from the handout.