SOLUTION: a=1/2b-4 Which of the following statements is true for this formulas? a.When the value of b is less than 8, a is negative b.When the value of b is greater than 8, a is negative?

Question 73414: a=1/2b-4
Which of the following statements is true for this formulas?
a.When the value of b is less than 8, a is negative
b.When the value of b is greater than 8, a is negative?
c.When the value of b is less than 8, a is positive.
d.When the value of b is greater than 4, a is positive.
Thanks!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
If we let b=8 then

If we chose a number less than 8 (say 6) then

So if b is less than 8 then a is negative (choice a)
If you are unsure, you can graph by letting a=y and b=x and you'll see which portions are positive and negative.

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