Mathematics
Solve :
12x + 15y + 18 = 0
18x - 7y + 86 = 0
Linear Equations
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Answer
12x + 15y + 18 = 0 …………… (1)
18x - 7y + 86 = 0 …………… (2)
Multiply 3 in the first equation and 2 in the second equation, then subtract both equations.
(12x + 15y = -18) x 3
(18x - 7y = -86) x 2
⇒ y =
⇒ y = 2
Substituting the value of y in equation (1), we get:
⇒ 12x + 15 2 = -18
⇒ 12x + 30 = -18
⇒ 12x = -18 - 30
⇒ 12x = -48
⇒ x = -
⇒ x = -4
Hence, the value of x = -4 and y = 2.
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