Transcript Chapter 1

Chapter 2.5
Formulas
1. The airlines are planning a nonstop flight
from Chicago to Prague. The distance is
approximately 4565 miles and the time of
the flight is 8.3 hours. Find the average
rate of speed for the flight.
d = rt
4565 = r (8.3)
8.3
8.3
r = 550 m/h
2.
Einstein’s equation relating energy E to
mass m and the speed of light c is
E = mc2. Solve it for m.
E = mc2
c2
c2
m = E2
c
3. Solve for y.
8 – 2y + 3x = 0
-3x
-8
-3x -8
= -3x – 8
-2
-2
-2y
y = -3x – 8
-2
-2
y = mx + b
Called slope
intercept form.
y = x + 4
3a. Solve for y.
4x + 3y = 18
-4x
-4x
3y = -4x + 18
3
3
y = -4x + 18
3
3
y = mx + b
Called slope
intercept form.
y = -x + 6
3b. Solve for y.
-3x + 5y = 15
+3x
+3x
5y = 3x + 15
5
5
y = 3x + 15
5
5
y = mx + b
Called slope
intercept form.
y = 53 x + 3
4. Solve for x.
H = 43 (2y + x)
1
1
4( H) = 4( 6 y) + 4( 3 x )
4
4
4H = 6y + 3x
-6y
-6y
4H – 6y = 3x
3
3
4H – 6y
x=
3
x = H – 2y
Chapter 2.5
Formulas