Solve x+y=9,x-y=5 by graphical method

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite