Which part of the ocean tends to determine the strength and longevity of an El Niño event?

the northern and southern parts of the ocean  

Explanation: the northern hemisphere and southern hemisphere parts of the ocean are big reasons that El Ni~no when the northern hemisphere part of the ocean warms up it changes the wind direction it mostly forms in the 4 corner states and the slower the oceans warm the longer and stronger it will last.

(4,-2)

explanation:

6x+4y=16

-6x-9y=-6

-5y=10

y=-2

x=4

i think it's severe storms but i might be wrong