The linear equation is:
y = mx +b, since the slope m is given (=7), the equation becomes:
y = 7x + b. We know that this function passes through a point with coordinates(3,2). In order to calculate b in y=7x+b, plug x and y by their respective values:
2= 7(3) + b
2= 21 +b and b = -19 . Hence the final equation is y = 7x - 19 (answer c)