# How am I doing on this

#### orchidpsycho

##### New member
Question says Find the line that satisfies the given condition.

Through (4,5); parallel to the y-axis?

Since it is parallel to ya axis I can use (0, any number) for coordinates?

If so I use

(0,4) (0,2)

(4-2)/(0-0)=M
M=2

Slope=2

y=mx+b
5=2(4)+b
5=8+b
-3=b

b=-3

#### stapel

##### Super Moderator
Staff member
Does the y-axis have a slope of 2? Then why does your "parallel" line?

Eliz.

#### orchidpsycho

##### New member
ah o.k.

it has a slope of 0 right?

b=5

b=5

#### stapel

##### Super Moderator
Staff member
How will any line, parallel to the y-axis, intersect the y-axis? So how could any such line have a y-intercept "b"?

And, no, it's horizontal lines that have a slope of zero, not vertical lines.

You need to review your concepts of slope, "increasing" and "decreasing" lines, horizontal and vertical lines, and "positive", "negative", "zero", and "undefined" slopes. This question is designed to test your understanding of these concepts.

Eliz.

#### orchidpsycho

##### New member
Thank you I will review these concepts as directed

#### orchidpsycho

##### New member
I have been reading on slopes and parallel lines and it seems that x=4 because the line is parallel to the y axis and the coordinate of every point must be 4

#### stapel

##### Super Moderator
Staff member
Exactly: "x = 4".

Eliz.

Thank You Eliz