X-2=-8 what add to 2 to make -8​

Which statement about the graph of y = 8(0.25)^2

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.