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Sayma
Answers (1)
(-1 , -3) = ( x,y) put the X and Y values into the first equation, Ax-4y=9 A(-1)- 4(-3)= 9 -A + 12=9 -A=-3 A= 3 [ Multiply by (-1)] Now put the X and Y values to the second equation, 4( -1) +B( -3) =-1 -4- 3B=-1 -3B= 3 B=-1 [ Multiply by negative (-1)]
