47. 5x - y ; x= 8 and y = 6
48. m - 4n; m= 5 and n = -3
49. a² – 7b; a= -3 and b= 7
50. -6(x – y);. x= 2 and y= 4
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47. 5x - y ; x= 8 and y = 6
48. m - 4n; m= 5 and n = -3
49. a² – 7b; a= -3 and b= 7
50. -6(x – y);. x= 2 and y= 4
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Answer:
47. 34
48. 17
49. -40
50. 12