y = 4/5
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(x+4)(x-5) = 0
5 and 6 is the factor pair for 5 x 6 equals 30
X2 + 4X - 5 = 0 what two factor of - 5 add up to 4? (X - 1)(X + 5) ----------------- ( so, X = 1 and X = - 5 )
5 x 4 equals 4 x 5 is commutative property.
x=4 y=5 9x+7y=?? Replace: 9(4)+7(5)= 71