HELLPPP

Solve the system by substitution.
-9x-10y=12
−3x+3=y

Step-by-step explanation:

We have:

Since we already have a variable value () in the second equation, it would be easiest to substitute the value for in the first equation:

Distribute into :

Combine like terms:

Add to both sides of the equation:

Divide by the coefficient of , which is :

_

Now that we have our value, we can substitute that in to the second equation to find our value:

Multiply:

Combine like terms:

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.