Answer:
Step-by-step explanation:
X = $ 10 dvd's.....y = $ 12 dvd's
x + y = 200....x = 200 - y
10x + 12y = 2200
10(200 - y) + 12y = 2200
2000 - 10y + 12y = 2200
-10y + 12y = 2200 - 2000
2y = 200
y = 200/2
y = 100 ....so there were 100 $ 12 dvd's sold
Answer:
(x - 3) (x + 4)
Step-by-step explanation:
roots are -4 and 3
then
f = (x + 4)(x - 3)
SA=<span>282.7433388230814</span>
Answer:
y=3x-9
Step-by-step explanation:
Hi there!
we are given a point (4,3), and a line (y=-1/3x+4)
Perpendicular lines have slopes that are negative and reciprocal; if they are multiplied together, the result is -1
first, let's find the slope of the new line.
we can find it with this formula: (m=slope)
-1/3m=-1
multiply both sides by -3
m=3
here's our equation so far, written in y=mx+b form, where m is the slope and b is the y intercept
y=3x+b
we need to find b
Because the line passes through the point (4,3), we can use it to find b
substitute x as 4 and y as 3
3=3(4)+b
multiply
3=12+b
-9=b
substitute into the equation
<u>y=3x-9</u>
Hope this helps!
