Answer:
Explanation:
so "b" here, represents the off-set, or in electrical engineering we call it the DC value. it just means how far off of zero is the line when x = 0 .
So the question is what is "Y" when x= 0. and this is what "b" represents.
There is a bunch of math that we could do to find slope and the equation of the line.
But, we can do this by inspection. I mean, just looking at the numbers.
Note that when x = -1, Y = 10 , then also, when x = 1 , Y= 4, sooo zero is excatly between -1 and 1 or, take the difference of 10-4 , the Y values, and find the middle. 10-4 = 6 and then take half of that to find the middle, or half of 6 is 3. so we know that at zero, Y = 4+3 or 10-3 , note that these are the same , 7. so know we know, when x=0, Y=7. So "b" = 7
got it? it's a lot of thinking, and understanding. But you can see that the math it self is not tough. :) any questions?