what is math a/w?
1 ——————— 1
4 ——————— -5
5 ——————- -7
7 ——————- -11
9 ——————– -15
what is the value of y when x is 15?
what is the value of x when y is -39?
thanks for the help/ love u all
Favorite Answer
For each ‘1’ that x changes, y changes by ‘2’ in the other direction.
This means that the points represent a straight line, and the general equation for that is:
y = mx + b
where ‘m’ is the slope and ‘b’ is the y-intercept.
We have already worked out that the slope is -2. But you can check it from any two points by using the standard (delta y)/(delta x) formula.
So far we have:
y = -2x + b
Substitute in an point given above, such as (1,1) :
1 = -2 + b
b = 3
Therefore the equation is y = -2x + 3
1. When x = 15, y = -2(15) + 3 = -27
2. When y = -39, -39 = -2x + 3
-42 = -2x
x = 21
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