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The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

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

3x + 4y = 5 x- 3y = -7 solve by substitution