Question

Solve
the given simultaneous equation 3x+4y+5 = 0; y=x+4.
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Answer 1

Answer:

answer is 192

Step-by-step explanation:

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Answer 2

Answer

$\sf \: 3x+4y = - 5 \: \: \: \: ...(1)$

$\sf y=x+4 \: \: \: ...(2)$

Now, substituting equation 2 in equation 1,

$\dashrightarrow \sf \: 3x+4y = - 5$

$\dashrightarrow \sf \: 3x+4(x + 4) = - 5$

$\dashrightarrow \sf \: 3x+4x + 16 = - 5$

$\dashrightarrow \sf 7x + 16 = - 5$

$\dashrightarrow \sf 7x = - 5 - 16$

$\dashrightarrow \sf 7x = -21$

$\dashrightarrow \sf x = \dfrac{ - 21}{7}$

$\dashrightarrow \sf x = - 3$

Now, substituting the value of x in equation 2,

$\dashrightarrow\sf y=x+4$

$\dashrightarrow\sf y= - 3+4$

$\dashrightarrow\sf y= 1$

Thus, the value of x and y is -3 and 1 respectively.