The gateaway arch in st. louis missouri weight about 20,000 tons. which amount could be the exact number of tons the arch weighs?

Are there options for this? because it could be anything that rounds up to 20,000 like 19,987 or 19,992. Theres a lot of possibilities.

The point-slope form can be simplified from the 2-point form.

y +4 = (-4-2)/(1-(-8))*(x -1) . . . . 2-point form
y +4 = -6/9(x -1)
y +4 = -2/3(x -1) . . . . . point-slope form

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Above is the usual form associated with the term "point-slope form." I prefer a form with the y-value of the point added to both sides:
.. y = -2/3(x -1) -4