Katrina recorded the average rainfall amount in inches for two cities over the course of 6 months City A: {5, 2.5 , 6 , 8.5 , 5 , 3}
City B: {7, 6, 5.5 , 6.5 , 5 , 6}
(A) what is the mean monthly rainfall amount for each city?
(B) what is the mean absolute deviation (mad) for each city? Round to the nearest tenth
(C) what is the median for each city

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form