Need quick help please???
1 answer:
B. because y is already solved
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1/3 ÷1/4 = 1/3 × 1/4 = 1/12
-4x + y = 6
-5x - y = 21
add both of them
-9x = 27
x = -3
(-4*-3) + y = 6
-12 + y = 6
y = 18
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