The domain is the independent variable (x), so in this case, it's be the amount of time James spent typing. James types for 15 minutes, so of course 0 and 15 have to be included, as it'll give a complete graph of what he's done so far.
To solve this problem we can think of a rule of three. Writing the rule of three we have: 3 ---> 2 x ----> 18 Clearing the value of x x = ((18) / (2)) * (3) = 27 answer zak will take 27 steps if rich takes 18 steps
To find the equation take the slope 2/3
y-y(1)=m(x-x(1)
y-4=2/3(x-8) = 2/3x-16/3
Next solve for y
y=2/3x-16/3 +4(turn 4 into a fraction with a common denominator)
y=2/3x-16/3 + 12/3
y=2/3x-4/3
