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What is the discriminant of x^2-6x+9=9? So ive been studying blood types and I m O+ but my daddy is ab- and my mom is a+ how is it possible that I got my blood type? What is the probability of rolling a number greater than 4 or rolling a number less than 6 on a six-sided die? In winter, how much difference is there between indoor and outdoor temperature? Would it be a few degrees or more / less? 3a - 4b = 7 2a - 3b = 6 Based on the equations, which of the following equations are true. A) b= a+1 B) b= a-1 C) b= -a + 1 D) -a - 1?