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m is probably the gradient :)
to find the gradient all you have to do is differentiate the original equation
y= 4x-1
therefore, dy/dx= 4
if you don't know calculus, use:
y=mx+c
m is the number in front of x
y= 4x-1
therefore m= 4
using normal algebraic methods, all I can get is m=0 and y=all numbers
M=3 because y+y+y= 3xY and MY= MxY
-1
y=m(x)+b
If y = mx + b, then x = (y-b)/m (for m not equal to zero).