1.4 Rewrite Formulas & Equations

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Presentation transcript:

1.4 Rewrite Formulas & Equations Algebra II

On page 26 in your book, you need to be familiar with the Common Formulas Chart on this page!

Ex. 1 Solve the formula d=rt for t. Then find the time it takes to travel 312 miles at an average rate of 48 miles per hour.

Ex 2: Solve the area of a trapezoid formula for b1. A = ½ (b1+b2) h 2A = (b1+b2) h

Example 3 Rewriting a linear equation A.) Solve 11x-9y= -4 for y. -11x -11x -9y=-11x-4 -9 -9 -9 B.) Solve 7x-3y=8 for x. +3y +3y 7x=3y+8 7 7 7

Ex. 4 Solve 2xy – 5y =8 for y. Then find the value of y when x =3.

Ex. 5 A campus bookstore sells T-shirts for $15 each & sweatshirts for $22 each. Write an equation for the bookstore’s revenue $ from selling m T-shirts & n sweatshirts. Solve the equation for m.

Ex. 5 (Continued) In order for the bookstore to have $6660 in revenue from sales of these two items during the fall semester, how many T-shirts must be sold if 150 sweatshirts are sold?

Assignment

Example 3: R = p1B + p2V Price of baseball cap # of caps sold You are selling 2 types of hats: baseball hats & visors. Write an equation that represents total revenue. Price of baseball cap # of caps sold # of visors sold Total Revenue Price of visor R = p1B + p2V

Ex. 4 Dry ice is solid CO2. It does not melt, but changes into a gas at -109.3oF. What is this temperature in oC?