Answer:
2.b=−a+93
3.c=−b+121
4.d= −1 /5 c + 87/ 5
Explanation:
2.
90+b+a−3=180
Step 1: Add -a to both sides.
a+b+87+−a=180+−a
b+87=−a+180
Step 2: Add -87 to both sides.
b+87+−87=−a+180+−87
b=−a+93
3.
90+b−31+c=180
Step 1: Add -b to both sides.
b+c+59+−b=180+−b
c+59=−b+180
Step 2: Add -59 to both sides.
c+59+−59=−b+180+−59
c=−b+121
4.
5d+3+c+90=180
Step 1: Add -c to both sides.
c+5d+93+−c=180+−c
5d+93=−c+180
Step 2: Add -93 to both sides.
5d+93+−93=−c+180+−93
5d=−c+87
Step 3: Divide both sides by 5.
5d/ 5 = −c+87 /5
d= −1 /5 c + 87/ 5
hope this helps let me know if you have a question