from 2 points
A line that passes through the points (-1,3) and (4,-2)
y= -x +2
slope = 3, y-intercept = 2
y = 3x + 2
0 24
1 21
2 18
3 15
y= -3x +24
graph (a)
y = -2x + 2
The value of a car decreases at a constant rate. After 3 years, the value of the car is $15,000. After 2 more years, the value of the car is $11,000.
y = 4000x +3000
A line that passes through the points (3,4) and (5,8)
y= 2x -2
(0, -4) , slope = -3
y= -3x -4
-2 -2
-1 -8
0 -14
1 -20
y = -6x -14
graph (b)
y = -4/5x + 4
Jeff is keeping track of his weight over several weeks. After 2 weeks, he weighs 194 pounds. After 6 weeks, he weighs 186 pounds. Write a linear equation.
y= -2x +198
A line that passes through the points (-3,1) and (5,5)
y= 1/2x -5/2
the slope is 2 and passes through the point (3,-4)
y = 2x -10
-1 -2
0 3
1 8
2 13
y = 5x +3
graph (c)
y = 3x +2
Customers of a satellite dish company must pay for installation of the dish, and a monthly fee for service. After 6 months, Ryan had paid $594. After 11 months, he had paid $989. Write a linear equation.
y= 79x +120