Question

2y+x=5, 10x+15y=105​

Answer 1

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Answer:

$2y + x = 5 \\ x = 5 - 2y........(i) \\ 10x - 15y = 105..........(ii) \\ \\ put \: value \: of \: x \: in \: eq.(ii) \\ 10x + 15y = 105 \\ 10(5 - 2y) + 15y = 105 \\ 50 - 20y + 15y = 105 \\ - 5y = 105 - 50 \\ y = - 55 \\ \\ 2y + x = 5 \\ 2( - 55) + x = 5 \\ - 110 + x = 5 \\ x = 5 + 110 \\ x = 115$

Hence, the value of x is 115 and y is -55.

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Answer 2

Answer:

x = 27, y = -11

Step-by-step explanation:

10x + 15y = 105 ...... (i)

2y + x = 5

or, 10(2y + x) = 50

or, 10x + 20y = 50  .....(ii)

Subtracting (ii) from (i),

-5y = 55 or y = -11

Now,

2y + x = 5

or, 2(-11) + x = 5

or, x = 5 + 22

or, x = 27

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