Helpppppppppppppppp please

Answer:Step-by-step explanation: 4.The solution of the equations is (1,1)     Ax+2By = 0  .................................................................(1)     2Ax-4By = 16 ..............................................................(2)   Substituting in equation 1 and 2 in (1,1)     A+2B = 0 ......................................................................(3)    2A-4B =16 ......................................................................(4)   Substitute A=-2B in equation 4    -8B = 16     B = -2     A = -2×-2 = 4  5. We owned an ice-cream shop     For 12 double cones you have $24     And want to sell it for $2.50     ∵For 10 double coins wr have to give $25