ABC is an isosceles right triangle in which has a slope of -2 and mABC = 90°. ABC is dilated by a scale factor of 2.6 with the origin as the center of dilation, resulting in the image A'B'C'. What is the slope of ?

I'm confused on how to dilate it and get a slope other than 0 for B'C'. Every time I do the problem I get 0 and that isn't the right answer