Answer: 90
Step-by-step explanation: Multiply each side by 18.
-50 + 60
= 10
10 - 70
= -60
-60 + 80
20
so he made a profit of $20
Answer: x=42
Step-by-step explanation:
To solve this problem you must apply the proccedure shown below:
- Solve for x.
- Add 10 and 4.
- Multiply the sum of 10 and 4 by 3. You must move it from the left member to the right member. Then, if 3 is dividing x, this will multiply the sum of 10 and 4. So, you have:

Therefore, you obtain that the value of x is 42
Working be x and classes be y
So
And
Graph both .
The solution region is the best way.(Blue part)
Answer:
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