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1 mark

If and , then what is equal to?

  1. A
    11
  2. B
    10
  3. C
    9
  4. D
    8

Solution & Step-by-step Explanation

Let's simplify the given equations:
Equation 1:



Equation 2:



From Equation 1, we know that . Substituting this into Equation 2 gives:



Now we have a system:

1.
2.

Substitute into Equation 1:





Divide the entire equation by 3:







If , then .
Therefore, .

Practice this question

Try it yourself before checking the explanation above.

If and , then what is equal to?
A
11
B
10
C
9
D
8

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