Help please i need so much help

6) in order  51º; 18º;123º;39º

7) in order   51º; 34º;95º;38º;47º;74º;59

Step-by-step explanation:

a triangle is 180º so 180-72-57=51

x+72=90        x=18

a line is 180º  so 180-57=x         x=123

a triangle is 180º  so 180-123-18=39

diagonals are congruent

180-129=51

180=51-95+x         x=34

180=47+95+x        x=38

180=59+x+47        x=74

i think 1: 2

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18