Please explain how?? 2-(-8)= 10

How is it 10

2-(-8)= 10

2+8=10

When two negative signs collide they turn to positive.

Here -(-8) changed to +8. Thus, 10 is the answer

Hope it helps :)

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value