The number of pairs of integer (x, y) satisfying x ≥ y ≥ - 20 and 2x + 5y = 99 is
Explanation:
Given, 2x + 5y = 99
⇒ x = (99 - 5y)/2
For x to be an integer, y has to be odd.
Possible value of x and y
x y 97 -19 92 -17 … 17 13
∴ Total 17 possible values.
Hence, 17.
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