Angles X and Y form a straight line. Angles W and Z form a straight line. Angles X and W are beside each other. Angles Y and Z are beside each other. Which equation represents the relationship of the measure of m∠X and m∠Y? m∠X = m∠Y m∠X + m∠Y = 90° m∠X + m∠Y = 100° m∠X + m∠Y = 180°