Hi

c-5d=2

2c+d=4      |checking our Answer  2*2+0 = 4



-2c+10d=-4

  2c+d= 4 

    11d = 0

      d = 0 and c = 2  (c = 2+5*0)



y=2x+3

y=4x-1      |checking our answer 7 = 4*2-1

 2x+3 = 4x-1

    4 = 2x

    2 = x and y = 7  ( 2*2+3) 

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