Download Little bit more on Direct variation

Little bit more on Direct variation
Tell whether the data show direct variation. If so, write an equation relating x and y.
14 karat gold chains (1 gram per square inch)
Title: Nov 13­8:20 AM (1 of 5)
Length x in inches
16
18
20
24
30
price y in dollars
288
324
360
432
540
Big
ie
gg
Bi
gie
Bi
ie
gg
ie
gg
Bi
the y­intercept is the point where the line crosses the "y" axis usually of the form (0, b)
Where "b" is a real number
Ex 1) find slope and y­intercept for the line y = 2x + 3 then graph
Ex 2) Same directions as ex 1.
"y" by itself
m = slope
b is y­int (0, b)
ex 3) same directions 5x + 2y = 10
assignment page 244, numbers 1,2, 4 ­ 24. Title: Jan 2­7:31 AM (2 of 5)
Dont Forget Quadratics
Solve
Quadratic Trinomial
1)
3x2 + 8x + 5 = 0
a=
b=
3) 4x2 - 9
b=
2)
y=
2
5
x+2
c=
Quadratic binomial
a=
Linear(find slope, y-intercept
and x-intercept)
Linear equation in standard form
4) 4x - 2y = 8
c=
Title: Jan 30­1:15 PM (3 of 5)
Title: Nov 12­9:18 AM (4 of 5)
Title: Nov 12­9:35 AM (5 of 5)