Let x and y be positive integers satisfying
3 x + 2 y + 4 x + 3 y = 1 1 z
with z = 3 .
What are the values of x and y ?
Submit your answer as the two-digit integer, x y .
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This is the exact same method I used!
For z = 3 , the equation reduces to 7 x + 5 y = 3 3 . Taking modulo of 5 on both sides, 2 x ≡ 3 (mod 5) ⟹ x ≡ 4 . Putting x = 4 in the equation, we have 2 8 + 5 y = 3 3 ⟹ y = 1 . Therefore, x y = 4 1 .
Wonderful idea!
First we simplify the equation to get 7 x + 5 y = 11(3); 33
Then, we should think of y as 1 to start
Input = x ; Output = x + 7 (Per Each Equation)
7(1) + 5(1) = 12
7(2) + 5(1) = 19
7(3) + 5(1) = 26
7(4) + 5(1) = 33
This shows that the answer is 41 since x is 4 and y is 1
x = 7 3 3 − 5 y
Only y = 1 , x = 4 are the positive integer values that satisfy this equation. So the answer is 4 1 .
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3 x + 4 x = 7 x
2 y + 3 y = 5 y
7 x + 5 y = 1 1 ( 3 ) = 3 3
Now setting y = 1 , we find out which value of x satisfies this equation:
7 ( 1 ) + 5 ( 1 ) = 1 2 = 3 3
7 ( 2 ) + 5 ( 1 ) = 1 9 = 3 3
7 ( 3 ) + 5 ( 1 ) = 2 6 = 3 3
7 ( 4 ) + 5 ( 1 ) = 3 3
Therefore, x = 4
Since we are asked to give our answer in the form x y , x y = 4 1