find positive integer solutions to 7x+6y=90
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Given : 7x + 6y = 90
To Find : positive integer solutions
Solution:
7x + 6y = 90
0 < 7x < 90 => 0 < x ≤ 14
0 < 6y < 90 => 0 < y < 15
=> x + 6x + 6y = 90
=> x + 6(x + y) = 6 * 15
=> x = 6(15 - x - y)
Hence x must be a multiple of 6
0 < x ≤ 14 => x = 6 or 12 are possible values
x = 6
=> 6 = 6(15 - 6 - y)
=> 1 = 9 - y
=> y = 8
x = 12
=> 12 = 6(15 - 12 - y)
=> 2 = 3 - y
=> y = 1
positive integer solutions are
( 6 , 8) & ( 12 , 1)
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