Chapter 2.5

Formulas

1. The airlines are planning a nonstop flight from Chicago to Prague. and

r = 550 m/h

8.3

d = rt

8.34565 =

The distance isapproximately 4565 miles the time ofthe flight is 8.3 hours. Find the averagerate of speed for the flight.

r(8.3)

2. Einstein’s equation relating energy E to mass m and the speed of light c is

E = mc2. Solve it for m.

c2E = mc2

c2

m =

Ec2

3. Solve for y.

-2

8 – 2y + 3x = 0

-2

-2y

-8 -8-3x-3x

y = -3x – 8-2-2

y = mx + b y = x + 4Called slope

intercept form.

= -3x – 8

3

4x + 3y = 18

33y

-4x-4x

y = -4x + 1833

y = -x + 6

3a. Solve for y.

y = mx + bCalled slope

intercept form.

= -4x + 18

+3x

5

-3x + 5y = 15

55y

+3x

y = 3x + 155 5

y = + 3x35

3b. Solve for y.

y = mx + bCalled slope

intercept form.

= 3x + 15

4( )4( ) 4( )

4H = 6y + 3x-6y -6y

4H – 6y = 3x3 3

H = (2y + x)34

x = 34H – 6y x = H –

2y

H = 64 y + 3

4x

1 1

4. Solve for x.

Chapter 2.5

Formulas