X is the center of the circle
5x - 14y = 22 ⇒ 5x - 14y = 22
-6x + 7y = 3 ⇒ <u>12x - 14y = -6</u>
<u>-7x</u> = <u>28</u>
-7 -7
x = -4
5x - 14y = 22
5(-4) - 14y = 22
-20 - 14y = 22
<u>+ 20 + 20</u>
<u>-14y</u> = <u>42</u>
-14 -14
y = -3
(x, y) = (-4, -3)
Since you don't know the value of b about the best that you could do is:
(2b)^4
16b^4
16b*b*b*b
3/5=6/10 so Naomi got 138.
Luke got 69.
And Natalie got 23.