Question

How can I solve this question

Answer 1

Plug in the values 1,4, and 9 into the equation one by one. Plug it in as the x value.

y=-1/2 times root 1 = -1/2
(x,y)=(1,-1/2)

y=-1/2 times root 4 = -1
(x,y)=(4,-1)

y=-1/2 times root 9 = -3/2
(x,y)=(9,-3/2)