-y= 4x + 1 -2y- 6x =6
a. substitution; (2,9)
b. elimination using multiplication; (0, 2)
C. substitution; (2. - 9)
d. elimination using multiplication; (-9, 2)

I believe the answer would be C.

Step-by-step explanation:

This is because after plugging in the numbers (2 in replace of x) (-9 in replace of y) for the problem -2y- 6x =6... the statement was determined true so, therefore, I believe the correct answer is C

there is no grid

step-by-step explanation:

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.