2x - 3y - z = -17 6x + 5y + z = -3 2x + 2y + 2z = 8

2x - 3y = Z

Step-by-step explanation:

5y + 2z = 2 + 12

what is the original number? you forgot to add it.

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.