While shopping Lucinda spent $48 . If the amount she spent was 15% of her savings how much savings did she have before she shopped

What is the point-slope form of theequation for the line with a slope of-2 that passes through (1, 4)? a y + 1 = -2(x + 4)b y-1=-2(x-4)c y + 4 = -2(x + 1)d y - 4 = -2(x - 1)

When you answer this can you explain

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