Error which occurs when an individual chosen for the sample cannot be contacted or refused to cooperate

Solve 2x+y=3 x+y=5 in substitution method

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2