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5 x 4 equals 4 x 5 is commutative property.
x=4 y=5 9x+7y=?? Replace: 9(4)+7(5)= 71
5*-4*-3 = 60
5 x 4 = 20 4 x 5 = 20
If x=4... then 'y' MUST equal 3 !