In order to solve the following system of equations by subtraction what of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them

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.

sweetheart, there isn't a cube below.

i belive false if so your welcome if not well idk