PLEASE HELP I cannot figure out the answer.

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°