Finding m & b from Equations
Writing Equations in Slope-Intercept Form
Writing Equations from Word Problems
100
State the slope and y-intercept from the equation:
y = 2x - 8
m = 2
b: (0 , -8)
100
Given slope and y-intercept, write the equation.
m = -7
y-intercept = 3
y = -7x + 3
100
Johnny bought a ski pass. It cost $125 for the season and $5 each time he parks his car in the lot. Write an equation modeling the cost, y, in terms of how many times, x, he goes up to the mountain.
y=5x+125
200
State the slope and y-intercept from the graph.
m = 1
b: (0 , 0)
y = 1x + 0
or
y = x
200
Given slope and y-intercept, write the equation.
m = -8
b: (0 , -20)
y = -8x - 20
200
Johnny's ski pass can be modeled by y=5x+125
How much will it cost if he visits the mountain 20 times this season?
y=5(20)+125
y=100+125
y=$225
300
What is the slope of a horizontal line?
slope = 0
300
Given slope and y-intercept, write the equation.
m = -25
b: (0 , 100)
y = -25x + 100
300
Cyneli has a new cell phone plan. The plan has a base monthly rate of $30, and then she has to pay $0.02/minute she calls people. Write an equation for the cost, y, in terms of minutes, x, she calls per month
y=0.02x+30
400
State the slope and y-intercept from the graph.
m = undefined
b: none
400
Given slope and y-intercept, write the equation.
m = -1/2
b: (0 , 0)
y = -1/2x
400
Cyneli's phone plan can be modeled by y=0.02x+30
How much will it cost if she talks for 320 minutes this month?
y=0.02(320)+30
y=6.4+30
y=36.4
$36.40
500
Identify the slope and y-intercept of the equation.
y-3=x
slope = 1
y-intercept = 3
500
Given the graph, write the equation.
y = 3x + 2
600
Identify the slope and y-intercept of the equation
2y=x-6
slope = 1/2
y-intercept = -3
600
Given the graph, write the equation.
y = -1