Slope = rise =m= y – intercept = b = the run point where the line crosses the y axis = difference of y’s starting point when difference of x’s graphing Graphing the line Special lines only contain – start with the y-intercept and then Linear one variable: move the rise and then the run. Positive slopes Equations x = any number (vertical line) Slope: Undefined y = mx + b increase from left to right. Negative slopes decrease from y = any number (horizontal line) left to right Slope : Zero Finding the equation of Finding the equation of the line in y= mx + b the line in y= mx + b form. form. Given: slope Finding the equation of Given: Two points. and y-intercept. the line in y = mx + b First find the slope (m) Substitute the “m” with form. Given: slope and then substitute one of the slope value and the (m) and a point the points x and y values “b” with the y-intercept (x,y). Substitute x, y, into y = mx+b along with value. and m into y = mx+b the slope. and find the value of b (the y-intercept). Then write the equation substituting m and b values into y = mx + b.