Question

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Answer 1

The equation of a straight line is given by:

y = mx + b

Where m is the slope of the line,

b is the y-intercept  

x and y are the coordinates of x-axis and y-axis, respectively.

If a straight line is parallel to x-axis, then x-coordinate will be equal to zero. Therefore,

y=b

If the line is parallel to y-axis then y-coordinate will be zero.

mx+b = 0

x=-b/m

Slope: Slope of the line is equal to the ratio of change in y-coordinates and change in x-coordinates. It  can be evaluated by:

m = (y2-y1)/(x2-x1)

So basically the slope shows the rise of line in the plane along with the distance covered in x-axis. Slope of line is also called a gradient.