exam Maths Puzzle Numerical Ability

Solve the system by addition. x + y = 9 x � y = 9

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exam Other Question

Using your calculator graph the function f(x) = x 2 + 2x � 3 over the interval
[-5,5]. Approximate any local maxima and local minima. Round your answers to two decimal places. I need help solving this problem. I need to use three different methods to solve; substitution, addition, and graphing:

x-y=12
2x+y=3

y=x-12
y=2x+3 is this how the problems