Transcript Algebra 1 4.7 Notes y  m xb m = slope m = rise run b = y-intercept x=0 SLOPE – INTERCEPT FORM.

Algebra 1
4.7 Notes
y  mxb
m = slope
m = rise
run
b = y-intercept
x=0
SLOPE – INTERCEPT
FORM
y  mxb
f ( x)  mxb
The value of f at x is mx + b.
How to use FUNCTIONS.
f ( x)  2 x  12
when
x  2
f (2)  2(2)  12
f (2)  4  12  16
How to use FUNCTIONS.
f ( x)  2 x  12
when
x0
f (0)  2(0)  12
f (2)  0  12  12
How to use FUNCTIONS.
f ( x)  2 x  12
when
f (1)  2(1)  12
f (1)  2  12  10
x 1
How to use FUNCTIONS.
f ( x)  2 x  12
10  2x 12
 12
22  2x
22
11  x
 12
when
f ( x)  10
x  11
How to use FUNCTIONS.
f ( x)  3x  10
2  3x 10
 10
 10
12  3x
33
4 x
when
f ( x)  2
x4
How to use FUNCTIONS.
f ( x)  3x  10
when
f (3)  3(3)  10
f ( 3)  3( 3)
x  3
f ( x)  9
Word Problem Practice
$10 per car as an entrance fee.
Higgins Lake State Park charges $5 per car as an entrance fee.
Write and graph an equation for each park.
Fort Wilkins State Park charges
20
f(x)=10x
g(x)= 5x
15
10
5
Graph the following 2 functions
on this graph.
f ( x)  2 x  2
g ( x)  2 x  5