exam Maths Puzzle Numerical Ability

graph y=-2
3x-y=-1

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im looking for the slope in percent of PH BUFFER SOLUTIONS. The readings are 4.00, 7.02, and 10.07. my question is what is the slope percent? Can you help me? The density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?