 Write
the equation of the line that goes
through the point (-1, 4) and (2, 0)
 Write
the equation parallel to the line y= ½x-1
that goes through the point (2, -7)
 Write
the equation of the line perpendicular
to the line shown.
 Writing


equations of lines
Calculate slope
Plug in point to find y-int “b”
 Parallel=
same slope
 Perpendicular= opposite reciprocal slope
 Bananas
cost $0.70 each, and peaches cost
$0.90 each. If you want to spend exactly
$21.20 at the stand and you need to buy 11
bananas, how many peaches can you buy?
 Let b represent the number of bananas, and
p represent the number of peaches.
 Suppose
that the water level of a river is 34
feet and that it is receding at a rate of 0.5
foot per day. Write an equation for the
water level, L, after d days. In how many
days will the water level be 26 feet?
 In
order to join a movie rental service, there
is an initial $60 fee, then a $5 fee every
month. Write an equation in slope-intercept
form modeling this situation, then use it to
find out how much you will have paid after
10 months of this service.
A
caterer charges $120 to cater a party for
15 people and $200 for 25 people. Assume
that the cost, y, is a linear function of the
number of x people. Write an equation in
slope-intercept form for this function. What
does the slope represent? How much would a
party for 40 people cost?
 The
Ramey family bought 4 sandwiches and 3
salads. They spent $24. Let x be the cost of
a sandwich and y be the cost of a salad. If
each sandwich cost $3.75, how much did
each salad cost?
 Equations


Find two data points  calculate slope, y-int
One time “fee” = b, slope/ rate of change
 Equations


in slope intercept form
in standard form
Two comparative quantities
Ax + by = c, where c is a sum or total
 Construct
a scatter plot with line of best fit
for the following data. Find the equation of
the line of best fit.
X
Y
1
2
2
2
2
3
3
4
4
3
4
6
5
4
5
5
6
7
 Know
difference between interpolation and
extrapolation
 Use equation of best fit to interpolate and/or
extrapolate