Although you have not included the statements about the solution to the set of the given equations, I can explain you what happen with that system.
You can arrive to the same conclusion by any method of solution of systems that you like.
The quickest in this case, is to multiply the equation of the lIne F by 5.
That leads to: 5 (x + y) = 5(8)
⇒ 5x + 5y = 40.
Now you can realize that the two representations (equations) correspond to the same line.
That means that there are infinite solutions, this is infinity values of x and y meet both equations.
If you graph line E and line F they overlap in the entire domain, so the graphing method also tells you that you cannot find one solution but infinite soluttions.
we know that

we are given 2.5L
so, to find 2.5L into mL, we will have to multiply both sides by 2.5

now, we can simplify it

so, option-C.............Answer
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Answer:</h3>
, or 
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Explanation:</h3>
Use the Keep Change Flip method. Change the sign to multiplication and flip the second fraction. 
Multiply the numerators and the denominators separatley. 
This cannot be simplified further, but it can be converted to a mixed number (as opposed to an improper fraction). 
Well I know that it will take Clark 4 hours to catch up to Mitchell
Explanation: what you have to do is find the common multiple of both of them
I created a little table to explain
And each hour I would add 60 to Mitchell’s and 75 to Clark, as for the equations I’m not completely sure, but I do know that time= distance/rate which means if I were to make equations I would do 300/60=t and for Clark’s I would do 300/75=t and in this case you can find t =4, I’m not sure how right the equations are just so you know, but I know it’s 4 hours, hope this helps