If 3x + 2y = 8 and x is twice the value of y, what is the value of x
-y?

Step-by-step explanation:

Given:

since x is twice the value of y , this means that :

 .......................... **

we will the substitute it into the main equation , that is we will substitute 2y in place of x. so the equation becomes :

divide through by 8

substitute y = 1 into equation ** , that is

this means that :

and , so

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: