exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (-1,7) and (-1,1)

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exam Other Question

If g(x) is an inverse of f(x)then how do the ordinate and abscissa coordinates on the points of f(x) map onto coordinates of g(x)? Can you please take the time to help me solve this problem: If f(x) = x2, then find { [ f(x+h) - f(x) ] / h } in terms of x and h.

Thank you