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Question 1115411: https://vle.mathswatch.co.uk/images/questions/question2571.png <- go to this link
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

equation of the line is:
y=mx%2Bb where m is gradient and b is y-intercept
if given m=3 and point (-1,3), we have
3=3%28-1%29%2Bb.... solve for b
3=-3%2Bb
3%2B3=b
b=6
plug m=3 and b=6 in y=mx%2Bb
y=3x%2B6=> your equation

check: