If it takes sally 5 hours to clean the house, how long will it take sally and her two friends to do the job if they work at the same rate?

a. 1 1/3

b. 1 2/3

c. 2 1/3

d. 2 2/3

Option B.

Step-by-step explanation:

Sally takes time to clean the house = 5 hours

If Sally and her two friends do the job at the same rate,

The time for the same work done by 3 people  = time taken by one / number of people

=

=

It will take hours to clean the house by 3 people.

-2,2

Step-by-step explanation:

1) First, we need to substitute x + 4 for y in the 2nd equation so your equation should now look like this...

2) x + 4 = -2x -2 Now we need to add 2x to both sides of this equation

so x plus 2x is 3x and -2x plus 2x is o so your equation should now look like this

3) 3x + 4 = -2 So now we need to add -4 to both sides so 4 plus -4 is zero and -2 plus -4 is -6 so your equation should look like this..

4) 3x + -6  now we need to divide both sides by 3 so 3x divided by 3 is 1 and -6 divided by 3 is -2 so your equation should look like this

5) x = -2 now we know what our x is but we need our y so we need to substitute -2 for x in the equation y= x + 4 so y= -2 + 4 Now add -2 to 4 and get 2 now you have your Y

Solution (-2,2)