Question 1130335


5x-4y = -17
y = 5x-7<br>

Substituting for y in the top equation by the RHS of the bottom equation:
5x - 4(5x-7) = -17
5x - 20x + 28 = -17
-15x = -45
  15x = 45
     x = 45/15 = 3   —>  y = 5(3)-7 = 15-7 = 8
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Ans:  x=3, y=8