# Math help

#### Subhotosh Khan

##### Super Moderator
Staff member
Can someone help with this? Thank you
You have been taught to write the equation of a line in slope-intercept form. Apply that in these problems. Calculate/estimate slope-intercept of each line from the given graph of the line.

Please show us what you have tried and exactly where you are stuck.

Please follow the rules of posting in this forum, as enunciated at:

#### Kaylee803

##### New member
I don't know how to do that

#### Subhotosh Khan

##### Super Moderator
Staff member
You have been taught to write the equation of a line in slope-intercept form. Apply that in these problems. Calculate/estimate slope-intercept of each line from the given graph of the line.

Please show us what you have tried and exactly where you are stuck.

Please follow the rules of posting in this forum, as enunciated at:

Have you been taught to write the equation of a line in slope-intercept form?

No

#### Harry_the_cat

##### Elite Member
Ok. The equation of a line can be written as y = mx + c where c is the y-intercept and m is the gradient (slope).
So, once you have c and m, you can form the equation.

Let's look at the first graph.

1. What is the y-intercept, ie the value where the line cuts the y-axis. This is the value of "c".
2. What is the gradient of the line? For this you will need to read off 2 points on the graph. One is (0, c). Find another point which is easy to read off the graph (ie preferably where the grid lines meet). Then find the gradient between these two points. (Do you recall the formula for gradient?)
This will give you the value of "m".
3. Substitute your values for c and m into y=mx+c and that is the equation you want.

(Note: Depending on where you are from, you may have learnt this as y = mx+b. Same deal.)

Show us your answer for Question 1 so that we can see you are on the right track..