We are given two points: (4, -8) and (8, 5)
General equation of a line: y = mx + c
First find m (the gradient). There is a formula for this: (change in y)/(change in x) = gradient
(5 - -8) / (8 - 4) = (13) / (4) = 3.25 = m
y = 3.25x + c
Now we need to find c (the y-intercept; the value of y when x=0).
Substitute in any one of the coordinates - let's use (8, 5)
(5) = 3.25(8) + c
(5) = 26 + c
c = -21
The equation of the line: y = 3.25x - 21
I think that this answer is correct - sorry if it seems rushed.
Hope this answer helps :)
Y=mx+b now just re do them
Answer: 7.25%
Step-by-step explanation:
There are a few ways to do this, but the easiest might be to set up a proportion:
321.75/300 = x percent/100 percent
Now cross multiply;
300x = 321.75(100) = 32,175
Divide both sides by 300 to solve for x:
300x/300 = 32,175/300
x = 107.25 This means that the tip was 7.25% on top of the $300 meal.
Y=3 because it is horizantal line that is between 0 and 6
