The x in y=mx+b is the independent variable. You could solve for x, making this a function of y, with simple algebra.
y = mx + b
y - b = mx
(y-b)/m = x
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the answer is: (y-b)/x = m y = mx + b y - b = mx (y-b)/x = m
If the equation Y = mX + b is graphed on standard Cartesian orthogonal x-y coordinates, then: -- the graph is a straight line -- 'm' is the slope of the line -- 'b' is the Y-intercept, i.e. the number where the line crosses the Y-axis, i.e. the value of 'Y' when X = 0 .
It is the intercept: the value that y takes when x = 0
-8
a=64 b=8 (x+16x+64)=(x+8)^2