exam Maths Puzzle Numerical Ability

Find the axis of symmetry of y = 2x squared + 8x - 7

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exam Other Question

Please graph the following: y=2x. Thanks!!!! McGraw Hill 6th edition, Chp. 71. Problem # a. Can someone help me solve this problem using the Substitution or Elimination Method?

y=5x+2 3x-y=-13