Book Maths Puzzle Algebra

Find the slope of the line 3x + 9y - 7 = 0

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Book Other Question

State whether the following function has a maximum value or minimum value and find it? f(x)=2+10x - x^2 (to the power of 2:forget it) Q1) If 1 is subracted from the numerator and 2, added to the denominator of a fraction, it becomes 1/2. The fraction becomes 2/3, when 1 ,is subracted from its numerator and 2, from its denominator. Find the fraction.

Q2) A number consists of two digits . The digit at ten's place is 4 times the digit at unit's place . On changing the place of digits , the new number is formed is 54 less than the original number . Find the numbers.