The wrong information has been given to form a straight line equation but in general a straight line equation is in the form of y = mx+c whereas m is the slope and c is the y intercept
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That will depend on the value of the slope which has not been given.
Point-slope form is written as: y-y1=m(x-x1), where (x1, y1) is a point on the line and m is the slope (hence the name, point-slope form).
The general equation of the line is y = 3x + c. Having only one coordinate (21) of a point on this line is not enough to evaluate c.
Given a point P(a,b) and slope m, the point slope equation is (y - b)/(x - a) = m
point of intersection