Pr act i ce an d Pr o b l em - So l v i n g Ex er ci ses
Practice Find the slope and y-intercept of the graph of each equation.- y = 3x+l 8. y=-x + 4
- y=-3x+2 11. y = 5x — 3
- y = 4 14. y=-0.2x+3
Write an equation in slope-intercept form of the line with the given
slope m and y-intercept b.- m = l ,b = -1
- m = 0.7, b = —2
17. m = 3 ,b = 2 - m = -0.5, b = 1.5
Write an equation in slope-intercept form of each line.
22. A y
4
10 X
*>Z- \
— ^y
‘\
Y
-2 C
2See Problem 1.- y = 2x - 5
- y = - 6 x
- y = \ x-3
4^ See Problem 2.- m
- m = -2 ,b = \
4^ See Problem 3.Write an equation in slope-intercept form of the line that passes through the
given points.- (0, 3) an d (2,5) 29. ( - 2 , 4 ) a n d (3, - 1 )
See Problem 4.- ( - 3 , 3) an d (1, 2)
Graph each equation,- y = x + 5
See Problem 5.- y=3x + 4 33. y=- 2 x+l
- Retail Sales S uppose you have a $5-off co u p o n at a fabric store. You buy ^ See Problem 6.
fabric th at costs $7.50 p e r yard. Write an eq u a tio n th a t m odels th e total
am o u n t of m on ey y you pay if you buy x yards of fabric. W hat is th e graph of the
equation? - Temperature The tem p eratu re at sunrise is 65°F. Each h o u r d uring th e day, the
tem p eratu re rises 5°F. Write an equation th a t m odels th e tem p eratu re y, in degrees
F ahrenheit, after x h ours durin g th e day. W hat is th e graph of the equation?
312 Chapters Linear Functions