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This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges