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3. [4 marks] The death rate (per 100,000 people) y in year z from heart disease and cancer is approximated by the equations Heart Disease:

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3. [4 marks] The death rate (per 100,000 people) y in year z from heart disease and cancer is approximated by the equations Heart Disease: 13.6x + 2y = 644 Cancer: 1.8r + y = 216 where : = 0 corresponds to the year 1995. Use the substitution method to determine when the death rates for heart disease and cancer were the same, and what the common death rate y was at that time

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