Answer: The total amount the water change was -28 gallons by the end of the week <u>OR</u> The total amount the water changed decreased 28 gallons by the end of the week. Depending on how you want to word it.
Hope this helps!
Step-by-step explanation:
<u>Create you equation:</u>
x = the total amount the water changed
d = the amount of days
x = -4d
<u />
<u>Insert the known information into the equation and solve:</u>
x = -4d
x = -4(7)
x = -28
The slope of the line is -2
Let's simplify step-by-step.
(
x
−
3
)
2
+
2
Distribute:
=
x
2
+
−
6
x
+
9
+
2
Combine Like Terms:
=
x
2
+
−
6
x
+
9
+
2
=
(
x
2
)
+
(
−
6
x
)
+
(
9
+
2
)
=
x
2
+
−
6
x
+
11
