x
−
4
Interchange the variables.
x
=
2
y
−
4
Solve for
y
.
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y
=
4
+
2
x
Solve for
y
and replace with
f
−
1
(
x
)
.
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f
−
1
(
x
)
=
4
+
2
x
-4/-6, correct? Because you're dividing a negative by a negative, they cancel out, giving you 4/6. This would reduce to 1/3, or 0.33333333.
If this is the full question I think you’re answering, then Volume of the completed tower will be 160 cubic units
Try them and see.
For the first:
3(-3) + 0 = -9 . . . . not > -8
3(-2) + (-1) = -7 . . . is > -8 . . . . . 2) (-2, -1) is a solution
For the second:
4 - 4(-2) = 12 . . . . not ≤ -6
-2 -4(1) = -6 . . . . . is ≤ -6 . . . . . . 2. (1, -2) is a solution