Question

the diastance between point (3,1)and(0,y)is 5 find y

Answer 1

Let (3,0) and (0,y) be the points A and B respectively. Then according to question

AB = √(x2-x1)2+(y2-y1)2

5=√(0-3)2+(y-0)2

5=√(-3)2+y2

5=√9+y2

52=9+y2

y2=25-9=16

y=±√16=±4

So, y=4 or -4