exam Maths Puzzle Numerical Ability

Write a function that represents the data set (-4, 9), (0, 1), (1, -1), (3, -5),
(4, -7).

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exam Other Question

3. The linear equation

y= 0.15+ 0.79

represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for example, I need help solving this exponential equation

5x-2=3 3x+2