book Maths Puzzle Numerical Ability

writing mathematics

your friend needs help understanding how to find the slope of a parallel to a line that passes through the points (2,3)and (4,5). Write an explanation that w

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Walter ia a waiter. he earns a daily wage of $50, plus tips that are equal to 15% of the total dinners he serves. what was the total cost of the dinners he served if he earned $170 on tuesday? please help me with this problem {3a+b+c=7
a+3b-c=13
b=2a-1