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All numbers that have a 4 before a decimal point and some non-zero digits after the decimal point lie between 4 and 5. If the "between" is inclusive, then the numbers 4 and 5 (which can be followed by a decimal point and any number of zeros) also lie there.
An infinite number of points lie on that line. One such would be (40, 65).
No. y=2x+5, right? substitute 2 in for "x" as that is your x-coordinate y=2*2+5 = 4+5 = 9 which is not your given y-coordinate.