5x-y=6
9x+4y=5
what is the answer to this algebra problem?

Subtract both the equations by putting the variables at the same spot and multiplying one of the equations both so that you ave at least 1 similar constant
9x-y=6 (Multiply with 4)
5x-4y=5 

36x-4y=24
5x-4y  =5 (Change signs so that one of the variables get cancelled as they 
                  have same constant now)

36x-4y=24
-5x+4y=-5

31x=19

x=19/31 

Substitute x in equation to get y

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
hope this !