When solving the equation, which is the best first step to begin to simplify the equation? -2(x+3) = -10
O (-2)(-2)(x+3) --10(-2)
o (-2)(x+ 3) = -10(-3)
o ž (x+3) = -1
o žo (x+3) - =10

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.

c ) y = 2.5 x - 26.25