Solve the following system of equations for all three variables. 2x + 7y – 7z = 6
-2x + 3y +9z = -10
- 2x + 7y + 5z = -2

answer: the value of x is 7cm

step-by-step explanation:

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.