Given that 6
x
−
5
y
=
14

Find
x
when
y
=
2

x = 4

Step-by-step explanation:

If we plug y in, the equation becomes

6x - 5(2) = 14

6x - 10 =14

6x = 24

x = 4

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.