Answer:
B
Explanation:
4x - 3y = 9 → (1)
4x + y = 7 → (2)
Rearranging (1) in terms of x or y will involve using fractions, which we want to avoid if possible.
However, using equation (2) avoids introducing fractions.
In (2) subtract 4x from both sides
y = 7 - 4x → (3)
Then substitute y = 7 - 4x into (1) and proceed