Is the selected one correct, and if not state why and the correct answer

9x-8y=8

Step-by-step explanation:

4x-6y=13

-5x+2y=5

9x-8y=8

when you subtract a negative the negative turns to a postivie.

this means that you would be adding 4x and 5x which makes 9x and then subtrcacting 2y into -6y which brings that result to -8y and then lastly you are subtracting 13-5 which is 8

40 minutes

step-by-step explanation:

add the time and multiply by 2

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.