First, find the slope of the line between the two points using
Then use one point to calculate the b for
.
Step 1: slope
Step 2: calculate b
Right now we have
, so we'll plug in (2,4) for the x and y:
Now we build our slope-intercept equation:
But, this isn't standard form. We need to clear out the fraction and then move the x-term to the left.
Can you take it from there?