A y-intercept is a point where the graph of a function intersects with the y-axis of the coordinate system.
Letter B is used because it's not x, y or m, which are already used to name other parts of the graph, to avoid confusion. Any other letter would do just as nicely.
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It shows the relationship of y in terms of x. [y = (yIntercept) + ((slope)*(x))] [slope = (y2 - y1)/(x2 - x1)]
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Without the inclusion of an equality sign and not knowing the plus or minus values of the given terms it can't be considered to be a straight line equation
We know that the line passes through points (2, 2) and (0, 10) (since the y-intercept is 10).Using these two points, we can find the slope of the line,m = (10 - 2)/(0 - 2) = 8/-2 = 4/-1 = -4.Now by using the slope, m = -4, and the y-intercept, 10, we can write the equation of the line in the slope-intercept form, y = mx + b which isy = -4x + 10.
In an equation b or any other letters usually denotes the unknown variable.