Solve the simultaneous equations and . What is ?
Answer and explanation
Correct answer: D.
- Step 1: Multiply the first by 2 and the second by 3: and .
- Step 2: Add: , so .
- Step 3: Substitute: , so . Then .
Answer
.
Why not the others: : is the value of alone. : is the value of alone. : is rather than .
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