Question

Which one does not belong?

a 6x + 12y = 36
b 3x + 6y = 18
c 2x - 2y = 12
d x + 2y = 6

Answer 1

C 2x-2y =12

Explanation:

A, B, C and D are additional equations with x and y in ratio 1:2 and their totals also in equivalent increasing dimension.