It's is the formula of a straight line equation
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the answer is: (y-b)/x = m y = mx + b y - b = mx (y-b)/x = m
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
It is the intercept: the value that y takes when x = 0
It's 2. your equation is y=mx+b, so the gradient, or slope, is the "m" in the equation.
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 .