This is the symmetric property, for you divide 9 to both sides to get x, instead of adding (addition property of equality)
So symmetric property should be your answer
Hope this helps
3x-21=57
3x=21+57
3x=78
Divide by 3
X=26
Answer:
1,200
Step-by-step explanation:
Simple...
you have: (7,-7) and (6,-5)
Using

to find slope--->>>

=-2
m=-2
Using y=mx+b to find the equation of the line-->>(Use any of the coordinates)
(7,-7)
-7=-2(7)+b
-7=-14+b
-7=-14+b
+14 +14
7=b
y=-2x+7Thus, your answer.