5
7
k = f(n) = 7n
35 + 2k = 9k subtract 2k from each side 35 + 2k - 2k = 9k - 2k 35 = 7k divide both sides integers by 7 35/7 = (7/7)k 5 = k check in original equation 35 + 2(5) = 9(5) 35 + 10 = 45 45 = 45 checks out
Since r varies directly with s, we have r = ks (replace k with 5 and s with 7) r = (5)(7) r = 35
k would equal 8. you add the powers on one side of the equation together so you should end up with 7 to the power of 11 then you minus 7 to the power 3 from the opposite side of the equation leaving you with 7 to the power 8 equals 7 to the power k. you can then see that k is the equivalent of 8.
k=-7
4k-7 = 7 4k = 14 k = 3.5 or k = 7/2
35.
2+2+7=11 K?
3/7 of 35 is 15.
79 + k = 84 84 - 79 = k k = 5
Take 3k from both sides to get k-3 equals 4, so k is 7