Write the standard form of the equation of the line described.

7) through: (-5, 2), perpendicular to y = -(5/3)x + 2

Rewrite the equation in slope-intercept form and then use the slope and y-intercept to sketch a graph of the line with the given equation.

8) 5x - 2y = 6

Show all work as you solve the linear modeling problem below.

9) Apple sold about 55 million iPods in 2008, but as iPhones became more popular, the sales of iPods began to decrease. The number of iPods sold in 2011 was about 43 million. Write a linear equation in slope-intercept form to model this decrease in sales. Let x stand for the number of years after 2008 and let y stand for the number of iPods sold, in millions.