Solve the system of equations = r + 2y = -4 and 6r + 9y = -12 by combining the equations

Step-by-step explanation:

The line of symmetry is halfway between the zeros, so is found at ...

  x = (3 -1)/2 = 1

Part 1

If point (1-p, y) is on the graph, so is the point that is its reflection in the line of symmetry: (2 -(1-p), y) = (1+p, y).

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Part 2

If x=a is the line of symmetry, a=1, since x=1 is the line of symmetry as found above.

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Comment on midpoint & line of symmetry

If M is the midpoint between A and B, then ...

  M = (A+B)/2

  B = 2M -A . . . . solve for B

The reflection of a point (x, y) in the line x=a will be (2a-x, y). That is where the "2" comes from in the equation used in part 1.