QR =12 because you set up a proportion 21/14=x/8 then cross multiply and get 14x=168 then you divide and get 12
The system of equations is:
x = 2y
x*$10 + y*8 = $84
Solving it, we see that he worked 3 hours landscaping and 6 hours washing cars.
<h3>
How to write the system of equations?</h3>
First, we need to define the variables:
- x = number of hours washing cars.
- y = number of hours landscaping.
We know that Alexander worked twice as many hours washing cars as he worked hours landscaping, then:
x = 2y
We also know that he earned a total of $84, then:
x*$10 + y*8 = $84
So the system of equations is:
x = 2y
x*$10 + y*8 = $84
To solve it, we just replace the first equation into the second one:
(2y)*$10 + y*8 = $84
y*$28 = $84
y = $84/$28 = 3
So He worked 3 hours landscaping, and:
x = 2*y = 2*3 = 6
6 hours washing cars.
If you want to learn more about systems of equations:
brainly.com/question/13729904
#SPJ1
Jake would have 3.5 (3 and a half cupcakes)
you would do your amount of cupcakes multipled by 7/4 which gets you 3.5!
-6-(-2n)=3n-6+5
-6+2n=3n-6+5
-6+6-5=3n-2n
-5=n
Answer:
x= -1
Step-by-step explanation
First move the variables to the left and change it's sign
(-6+x-2x=-5)
Then combine like terms
(-6-x=-5)
Then move the -6 to the right and combine it with the -5
(-x=-5+6)
(-x=1)
Lastly change the signs by dividing by 1
(x=-1)
