b. (or "y = mx + c" in the UK see below) Equation of a Straight Line y=mx+b b is easy: just see where the line crosses the Y axis. m (the Slope) needs some. In the equation of a straight line (when the equation is written as "y = mx + b"), the slope is the number "m" that is multiplied on the x, and "b" is the y-intercept. Every straight line can be represented by an equation.

### Y mx b -

So when x equals one, y is equal to five. If x is equal to zero, then two times zero is zero, that term goes away, and you're only left with this term right over here, y is equal to three. So for every one that we increase x, y is increasing by two. And that makes sense because every time you increase x by one, you're gonna multiply that by two, so you're gonna increase y by two. Now you might be saying, well it says slope-intercept form, it must also be easy to figure out the slope from this form. And actually we're gonna have to graph five up here. This is the line, this is the line, y is equal to 2x plus three.