Help with these Math questions

snipez90
Sat, 24 Nov 2007 20:09:30 +0000

since x<2, y must be less than 2(2)+3 = 7, so it’s A… don’t over think this one. you could try some cases but if you think about it, x could be 1.99999 and y still has to be less than 7, it’s the only condition
plugging in leads you to E, but this equation is not hard to solve. cross multiply to get 5(x+a) = x(5+a) => 5x + 5a = 5x +xa -> 5a = xa => x=5
x^2-x-6 = 0 so (x-3)(x+2) = 0, this tells us that x = 3, or x = -2, so A B and C can be eliminated immediately. checking D shows that it is false as well, E on the other hand works and is the answer