5!/2!=120/2= 60 arrangements
Treat (a, 9) as an x and y value
Set the equation equal to 9
9= 2x+1
8= 2x subtract one
4= x divide by 2
a must be equal to four
So lets say you have a number, x
to get to the next counting number, you add one so
x+1 is the next counting number
product means the result of multiplying os
(x)(x+1)=
distribute [a(b+c)=(ab)+(ac)]
(x^2)+(1x)=x^2+x
Okay, so a general rule for finding perpendicular lines in the form of y = mx + b is y = (-1/m) + b.
First, let's ignore b (-7) because we're going to find that later.
A perpendicular line to y = 4x + b is y = -1/4x + b.
Alright, so now let's plug in the values. They are in the form of (x,y), so let's plug them in accordingly.
3 = -1/4(4) + b
3 = -1 + b
b = 4
y = -1/4x + 4
So a line perpendicular to y = 4x - 7 is y = -1/4x + 4.
