Match each system of equations to its point of intersection. y = 2x + 1 y = x + 3 y = x + 3 y = -3x − 2 y = -x − 7 y = x + 3 y = -x − 7 y = 2x + 1 y = 2x + 1 y = -3x − 2

Write the sentence as an equation. z plus 372 is equal to 160

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

1. if events a and b are non-overlapping events, how do you find the probability that one or the other occurs? 2. what does it mean if p(a or b) equals 1?