Question

I need a lot of help...plz :3

Answer 1

@jhonyy9 @sleepyjess

Answer 2

@ikram002p @Elsa213

Answer 3

A is somewhere on the dashed line.

Answer 4

we kind of guess that there are two possibilities for A.

Do you remember the formula for the distance between points (x,y) and (a,b) ?

Answer 5

isnt the formula d=\[d=\sqrt{(x-a)^{2}+(y-b)}\]

Answer 6

(y-b)^2*****

Answer 7

yes that's the one.

The statement says: `the distance between point A and point B is 15 units.`
How do you write that using the formula of the distance? (use the fact that A has x-coordinate -8 but unknown y-coordinate (call it 'y') ; B is (1,2))

Answer 8

\[15=\sqrt{(1-(-18))^{2}+(2-y)^{2}}\]

Answer 9

it's (-8) instead of (-18), typo I guess.
So: \[15=\sqrt{(1-(-8))^{2}+(2-y)^{2}}\]
You want to find the \(y\) (or \(y\)'s). So, solve this for \(y\).

Answer 10

I got 11.83....tbh i dont think thats right at all

Answer 11

you're right, it's not correct..
Step by step (you will see where you made a mistake):

\(15 = \sqrt{(1-(-8))^{2}+(2-y)^{2}} \)
\(\iff 225 = 9^2 + (2-y)^2 \)
\(\iff 144 = (2-y)^2\)
\(\iff (2-y) = 12 \) or \((2-y)=-12\)
\(\iff y = -10\) or \(y = 14\).

Answer 12

oooooooooooohhhh ok i see

Answer 13

so the two possible coordinates would be (-8,-10) or (-8,14)

Answer 14

right?

Answer 15

yes

Answer 16

OMG you're the BESTTTT

Answer 17

you did well too

Answer 18

When i was doing i kept getting confused on the "or" part