exam Maths Puzzle Numerical Ability

Can someone help me solve this problem using the Substitution or Elimination Method?

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

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exam Other Question
Find the axis of symmetry of y = 2x squared + 8x - 7 I had a line that goes through (12,-9) and has a slope of -1/3 would it be y=-1/3x+5