Is (7, –8) a solution to this system of inequalities?

y < 3/7x+ 7
y ≥ –x + 10

1 answer

To determine if the point (7, -8) is a solution to the system of inequalities, we need to substitute \(x = 7\) and \(y = -8\) into each inequality and verify if the point satisfies both.

  1. First Inequality: \(y < \frac{3}{7}x + 7\)

    Substitute \(x = 7\) and \(y = -8\):

    \[ -8 < \frac{3}{7}(7) + 7 \]

    Simplifying the right side:

    \[ -8 < 3 + 7 \] \[ -8 < 10 \]

    This is true.

  2. Second Inequality: \(y \geq -x + 10\)

    Substitute \(x = 7\) and \(y = -8\):

    \[ -8 \geq -7 + 10 \]

    Simplifying the right side:

    \[ -8 \geq 3 \]

    This is false.

Since the point (7, -8) satisfies the first inequality but does not satisfy the second inequality, the point (7, -8) is not a solution to the system of inequalities.