X^2 + y^2=40 and y=x-4 solve this simultaneous equation

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

How to find the exponential function y=ca^x, with points (1,2) and (2,1)