What is the R coordinate point write in in (x, y) form

(2,-4)

Step-by-step explanation:

First see the x value by starting at the R and going up until you get to the vertical x line the number there is the x value.  (2)

Then go back to the R and move to the horizontal y line and that value is your y value(-4)

ALWAYS remember X comes BEFORE Y

therefore (2,-4)

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1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.