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GuDViN [60]
3 years ago
5

X-y=11 if x=4 wat is y

Mathematics
1 answer:
Nata [24]3 years ago
4 0
Let's see this original ewuation:
x-y=11
1) Substitute 4 in for x: 4-y=11
2)Subtract 4 from both sides. This cancels out four. (4-4)-y=11-4
3)Cancel: -y=7
4)Multiply both sides by negative 1:-1*-y=11*-1 \\ y=-11

y=-11
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Georgia kassem installs fencing. she is paid $7.50 per hour for an 8-hour day and time and a half for overtime for any work over
Dominik [7]

Georgia worked overtime on 4 of the 5 days. Her total overtime hours were

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Then her pay for the week is

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An automotive repair center charges $45 for any part of the first hour of labor, and $25 for any part of each additional hour. W
IceJOKER [234]
The total cost is given by the equation:
C(t) = 45 + 25(h-1) where h is the number of hours worked.

We can check for each option in turn:

Option A:

Inequality 5 < x ≤ 6 means the hour is between 5 hours (not inclusive) to 6 hours (inclusive)
Let's take the number of hours = 5
C(5) = 45 + (5-1)×25 = 145
Let's take the number of hours = 6
Then substitute into C(6) = 45 + (6-1)×25 = 170
We can't take 145 because the value '5' was not inclusive.


Option B:
The inequality is 6 < x ≤ 7
We take number of hours = 6
C(6) = 25(6-1) + 45 = 170
We take number of hours = 7
Then C(7) = 25(7-1) + 45 = 195

Option C:
The inequality is 5 < x ≤ 6
Take the number of hours = 5
C(5) = 25(5-1) + 45 = 145
Take the number of hours = 6
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We can't take the value 145 as '5' was not inclusive in the range, but we can take 170

Option D:
6 < x ≤ 7
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Correct answer: C


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