Question

solve by using substitution method 3x-5y-4=0 and 9x=2y+7 [ class 10]

Answer 1

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Answer 2

Heya !!!


3X - 5Y = 4----------(1)


9X - 2Y = 7-------------(2)



From EQUATION (1) we get,


3X - 5Y = 4

3X = 4+5Y



X = 4+5Y/3 -------------(3)



Putting the value of X in equation (2)


9X - 2Y = 7


9 × (4+5Y/3) - 2Y = 7


3(4+5Y) - 2Y = 7


12 + 15Y - 2Y = 7


13Y = 7 -12


13Y = -5


Y = -5/13



Putting the value of X in equation (3)

X = 4+5Y/3 => 3 + 5 × -5/13 = 3 - 25/13 /3


X = 39 - 25/13/3 = 14/13/3 => 14/13 × 1/3 => 14/9



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