1. 4.1, 4.2, 4.3, 6.7 Quiz

2. Find the slope for each set of ordered pairs.
(5, 2) (3, -1)
(19, 4) (-13, -6)

3. Find the value of r so that the line through (2, 8) and (r, -4) has slope -3.

4. If y varies directly as x and y=9 when x=14, find x when y=21.
Direct variation: y = kx
9 = k (14)
k =
21 = x
Multiply each side by the reciprocal
x =

5. Write the equation of the line with the given slope and y-intercept.
Slope , y-intercept: -7
(0, 12), m=-8
y = -8x + 12

6. Write the slope intercept form of the equation for the line graphed.
Use ordered pairs to find slope
(3, 0) and (0, -2)
b= -2

7. Write a linear equation in slope-intercept form for the situation.
A video store charges $2.75 per rental and a $15 fee to become a member of the rental club.
A plumber charges a house call fee of $60 plus $45 and hour for as long as he is working.
y = 2.75x + 15
y = 45x + 60

8. Graph the equation
y = 5x

9. Graph the equation. 3x + 4y = 16 -3x -3x 4y = -3x +16 /4 /4 /4
/ /4 /4
y = -3/4x + 4

10. Graph the inequality. y > - x + 3 Test (0, 0) 0 > -3/4 (0) + 3
0 > 0 + 3
0 > false