Is a 90° counter clockwise rotation about the origin and then 180° rotation about the origin same as 180° rotation about the origin

No.

Explanation:

A 270°-clockwise rotation [90°-counterclockwise rotation] plus a 180°-rotation is the exact same as a 270°-counterclockwise rotation [90°-clockwise rotation]:

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step-by-step explanation:

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y = 3x+4

step-by-step explanation:

to find the slope

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

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4