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If the solution of the equation 9x-2 = KX + 7 of X is a natural number, then the value of integer k is______ ．
By changing the term, 9x-kx = 2 + 7 and merging the similar term, (9-k) x = 9, because the equation has a solution, so K ≠ 9, then the coefficient is obtained, x = 99 − K. also ∵ the solution of the equation 9x-2 = KX + 7 about X is a natural number, and the value of ∵ K can be: 0, 6, 8. The corresponding natural number solutions are: x = 1, x = 3, x = 9
If the solution of the equation 9x-2 = KX + 7 of X is a natural number, then the value of integer k is______ ．
By changing the term, 9x-kx = 2 + 7 and merging the similar term, (9-k) x = 9, because the equation has a solution, so K ≠ 9, then the coefficient is obtained, x = 99 − K. also ∵ the solution of the equation 9x-2 = KX + 7 about X is a natural number, and the value of ∵ K can be: 0, 6, 8. The corresponding natural number solutions are: x = 1, x = 3, x = 9
If the solution of equation 5x-2a = 8 is nonnegative, then the value of a is ()
A. a＞-4B. a＜-4C. a≥-4D. a≤-4
The original equation is sorted as: 5x = 8 + 2a, the solution is: x = 8 + 2a5, the solution of ∵ equation 5x-2a = 8 is non negative, 8 + 2a5 ≥ 0, that is 8 + 2A ≥ 0, the solution is: a ≥ - 4, so choose: C
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