Question

Which of the following is the equation of the vertical line that passes through. (4,6)
A. Y=6
B. y=4
C. X=6
D. X=4

Answer 1

Equations of vertical lines are always described using x. Since the point is (4,6) , the equation of the vertical line passing through that point should be x=4.

Answer 2

Thanks

Answer 3

No problem! :)

Answer 4

Can u help me with this one?
Write an equation in y=mx+b form for the table

# of books purchased -1-2-3-4
Cost of book club. -21-30-39-48
A. Y=3x+21
B. y=9x+12
C. Y=5x+21
D. Y=7x+12

Answer 5

@jkp269

Answer 6

Let me see…

Answer 7

I'm thinking that the # of books purchased are the x-values, and "Cost of book club" contains the y-values.

Answer 8

We can get two points from this table which can help us to find the slope.

Answer 9

So I'll choose (1,21) and (2,30)
The formula to find the equation using two points is: y-y1=m(x-x1)
m=(y2-y1)/(x2-x1)
Label your points so that it will be easy to plug them in.
x1=1
y1=21
x2=2
y2=30
So m=(30-21)/(2-1)=9/1=9

Now choose one point and plug into the formula:
y-21=9(x-1)
Simplify
y=9x-9+21
y=9x+12

Answer 10

Thanks again.