when x = 0 , f(x) = 1 so it will pass through the point (0,1). Also as x increases f(x) will decrease because the base 0.25 is < 1. So the graph will decrease to the right.
The + 5 in the function moves the whole graph up 5 units so the graph will pass through the point (0, 6).
Switch y=2x+7 to 2x-y=-7 then multiply that equation by 2 to cancel out the y's. that ends up as 4x-2y=-14 which then you get x=-24. then you substitute x into one of the original equations y= 2(-24)+7 which equals y=-41
We simplify this expression to 