Is (3, 9) a solution of the system y = 3x and 2x – y = 6?

No, (3, 9) is not a solution of the system.

Step-by-step explanation:

y=3x

2x-y=6

3(3)=9

2(3)-9=6-9=-3, not 6

46 dollars is the answer.

step-by-step explanation:

6*6 = 36,         36+10=46

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0