So, after one year will will have the new population of 23 000 * (100 %+2%)
(the 100 % is the old population and the 2% is the increase), that is:
23000*1.02=23460
(102 % can be represented as 1.02)
And for the next years, we have to repeat the procedure.
a more generic rule would be:
y=23000*

(x is the number of years passed)
Answer:
Oblique downward straight line expression:
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Straight line expression:
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490x + 700y < = 4000 (thats less then or equal)
Fraction? They are already decimals