Write an equation for the line.

Question

xstereoskylinex · Answer

attachment

3mar · Answer

May I help?

xstereoskylinex · Answer

yes,please.

3mar · Answer

There are more than one form of line equation:
- slope-intercept:
$$y=mx+b$$
- two points on the line:
$$\frac{ y_2-y_1 }{ x_2-x_1 }=\frac{ y-y_1 }{ x-x_1 }$$
- slope and point on the line:
$$m=\frac{ y-y_1 }{ x-x_1 }$$

What do you pick? and suitable for the given data?

xstereoskylinex · Answer

first one?

3mar · Answer

why?
do you have the slope?
and the intersection with y-axis?

mathmale · Answer

From the given graph you can read off the y-intercept of this line immediately.  What are the coordinates of this y-intercept?

3mar · Answer

I need him to extract them. Be patient!

mathmale · Answer

You could easily pick any 2 distinct points on this line and then plug the coordinates into the slope formula.  Choose the appropriate formula from the post by 3mar (above) and calculate the slope.

Share your answers here, please.

3mar · Answer

These are points on the line. Do the maths.

3mar · Answer

Where are you, @xstereoskylinex?

xstereoskylinex · Answer

I think I figured it out, thanks for the help!

3mar · Answer

Thank you for the medal!