1. Chapter 2.5 Formulas

2. 1. The airlines are planning a nonstop flight from Chicago to Prague. and r = 550 m/h 8.3 d = rt 8.3 4565= The distance is approximately 4565 miles the time of the flight is 8.3 hours. Find the average rate of speed for the flight. r (8.3)

3. 2.Einstein’s equation relating energy E to mass m and the speed of light c is E = mc 2. Solve it for m. c 2 E = mc 2 c 2 m = E c2c2

4. 3. Solve for y. - 2 8 – 2y + 3x = 0 - 2 - 2y -8 -8 -3x -3x y = - 3x – 8 -2-2 -2-2 y = mx + b y =  x + 4 Called slope intercept form. = - 3x – 8

5. 3 4x + 3y = 18 3 3y -4x -4x y = - 4x + 18 3 3 y = - x + 6 3a. Solve for y. y = mx + b Called slope intercept form. = - 4x + 18

6. +3x 5 -3x + 5y = 15 5 5y +3x y = 3x + 15 5 5 y = + 3 x 3 5 3b. Solve for y. y = mx + b Called slope intercept form. =3x + 15

7. 4( )4( )4( ) 4H = 6y + 3x -6y -6y 4H – 6y = 3x 3 3 H = (2y + x) 3 4 x = 3 4H – 6y x = H – 2y H = 6 4 y + 3 4 x 1 1 4. Solve for x.

8. Chapter 2.5 Formulas