Using substitution or elimination 3y=-1/2x+2. y=-x+9

(x, y) = (10, - 1)

Step-by-step explanation:

given the 2 equations

3y = - x + 2 → (1)

y = - x + 9 → (2)

substitute y = - x + 9 into (1)

3(- x + 9) = - x + 2

- 3x + 27 = - x + 2

add x to both sides

- x + 27 = 2 ( subtract 27 from both sides )

- x = - 25

multiply both sides by 2 and divide by - 5

x = 10

solution (10, - 1)

a. the residual plot for model 1 has a random pattern and is a good fit for the data.

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.