Answer:
-8±√17 and -8±6√2
Step-by-step explanation:
1. x+16/x=4, x^2+16-4x=0. x=-8±√17
2. x+16/x=8, x^2+16-8=0. x=-8±6√2
The whiteboards she bought cost $35, and she spent a total of $51.20, subtract to find out the total amount she spent on posters:

So she spent a total of $16.20 on posters, now divide by the amount one poster costs to find out how many posters she bought.

So she bought 3 posters.
Answer:
x - 1
Step-by-step explanation:
3(3x + 3) - 2(5 + 4x)
9x + 9 -10 - 8x
x - 1
hope this helps!
Answer:
y = - 10x
Step-by-step explanation:
The equation representing a proportional relationship is
y = kx ← k is the constant of proportionality
y = - 10x ← is the only equation in this form
Thus the equation is y = - 10x with k = - 10