Question

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Answer 1

Answer

Option D

Step-by-step explanation:

ax + 6y = a - 6. ,6x - 9y = 9 + 6

put x = 1, y = -1, then we get

a(1) + 6(-1) = a -6. , 6(1)-9(-1)=9 +6

a - 6 = a - 6. , 6 +9 = 9 + 6. or 15 = 15

Therefore

LEFT HAND SIDE IS EQUAL TO RIGHT HAND SIDE

HENCE PROVED