Hi,

doing the Graphing First

y = 2x+3 green  p(0,3) and P(3,9) Plot, connect with line

y = 3x-6 blue   P(0, -6) and P(2, 0) Plot, connect with line

Line intersect at(9,21), x = 9,  y = 21 the solution



Let's see

15x - 5y = 30

 2x - y = -3  Multiply by 5 and subtracting from 1st EQ to eliminate y

     5x = 45

      x = 9  and using y = 2x+3,  y = 21



 

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