system
The husband and wife discuss the equation for a line, where m is the slope and b is the y-intercept. They discuss how the equation can be used to plot points on graphs and draw lines through them.
human
Hey, you know the equation for a line?
gpt
Um, no.
human
It's y=mx+b.
gpt
What does that mean?
human
The m is the slope of the line and b is the y-intercept. 
gpt
Okay, that makes sense. 
human
Do you remember when we learned about slopes in math class?
gpt
Yeah, vaguely. 
human
Well, the slope is basically a measure of how steep the line is. 
gpt
Ah, gotcha. 
human
And the y-intercept is where the line crosses the y-axis. 
gpt
So, how does this all come together to make a line? 
human
Well, you can use this equation to plot points on a graph and then draw a line through them. That line will have the same slope and y-intercept as the equation. 
gpt
I see. It's been a while since I've dealt with this stuff. 
human
It never hurts to refresh your memory every once in a while. Plus, understanding math can be really useful in everyday life. 
gpt
Yeah, I agree. Thanks for explaining it to me.