The graph represents y = −4x + 7 . Which statements are true about the graph?

Responses
A The coordinate pair (1, 3) represents a point on the graph and a solution to the equation.
B The coordinate pair (2, 0) represents a point on the graph and a solution to the equation.
C The coordinate pair (1, 4) represents a point on the graph and a solution to the equation.
D The coordinate pair (0, 7) represents a point on the graph, but not a solution to the equation.
E The coordinate pair (2, −2) does not represent a point on the graph or a solution to the equation.

1 answer

To determine which statements are true about the graph of the equation \( y = -4x + 7 \), we can plug in the x-coordinates from each of the coordinate pairs given in options A through E and see if the resulting y-value matches the y-coordinate of the pair.

  1. For (1, 3): \[ y = -4(1) + 7 = -4 + 7 = 3 \] This matches the y-coordinate, so A is true.

  2. For (2, 0): \[ y = -4(2) + 7 = -8 + 7 = -1 \] The result does not match the y-coordinate, so B is false.

  3. For (1, 4): \[ y = -4(1) + 7 = -4 + 7 = 3 \] The result does not match the y-coordinate, so C is false.

  4. For (0, 7): \[ y = -4(0) + 7 = 0 + 7 = 7 \] This matches the y-coordinate, so D is false (since it represents a point on the graph and is a solution to the equation).

  5. For (2, -2): \[ y = -4(2) + 7 = -8 + 7 = -1 \] Since the y-coordinate of this pair (-2) does not match the computed value (-1), E is true, as it does not represent a point on the graph or a solution to the equation.

Summary of Results:

  • A: True
  • B: False
  • C: False
  • D: False
  • E: True

The true statements are A and E.