Question 26319
hi, the full method of working is as follows:


y=mx+c is the standard form for a straight line...doesn't matter that you wrote b...just that c is the term usually used.


Anyhow...m is gradient, so we have y=3x+c


we need to find the value of c. To do this, we need to know x and y at a specific point, which we do... (-3,1).


So, 1 = 3(-3) + c
--> 1 = -9 + c
--> 10 = c


so the equation of the straight line is y = 3x + 10.


Basically, i think you wrote the 1 into the equation for some reason from the co-ordinates. This is definitely incorrect! :-)


jon.