Thread: Finding X in y = mx + b equations

Hello:

I am doing a math worksheet that I was given by my teacher, the sheet is full of slope problems. y = mx + b. You are given two points:

Example:

(4,1) (5,3) and you have to find what Y = and my answer was Y = 2x - 7
------------------------------

There are two equations on here where it says X = for the answer instead. The two points are (4,1) and (4,13).

Hopefully I am not being too confusing, thanks in advance for any help.

Originally Posted by CzWJF41

Hello:

I am doing a math worksheet that I was given by my teacher, the sheet is full of slope problems. y = mx + b. You are given two points:

Example:

(4,1) (5,3) and you have to find what Y = and my answer was Y = 2x - 7

Hi there



with



is now



so far so good.

Now use either point to find b. Using gives



so

Good news for you!

and are on the line .

You may sketch these two points in a coordinate system and construct a line through them, and as it can be seen this line is actually perpendicular to the x-axis.

That means, all points designated as (4, a) (a can be any real number) are on the line because they all satisfy the condition that x = 4, given that there is nothing required for y.