Answer:
-2 or -12
Step-by-step explanation:
using distance formula:
[tex]d = \sqrt{( {y2 - y1)}^{2} + {(x2 - x1)}^{2} } \\ 13 = \sqrt{ {(15 - 3)}^{2} + {(x + 7 )}^{2} } \\ 169 = 144 + {(x + 7)}^{2} \\ {(x + 7)}^{2} = 25[/tex]
Get the square root of both sides
(x+7) = ± 5
x1 = -7+5 = -2
x2 = -7-5 = -12
Note:
As I write Y1, X1, these means Y sub 1 , x1, and so on.
