If x +5y=16 and x=-3y, then y=?

If x +5y=16 and x=-3y, then y=? Correct Answer 8

x + 5y = 15 ……..(i)x = - 3y …………(ii)<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo><mo>(</mo><mi>i</mi><mo>)</mo><mo>&#x21D2;</mo><mo> - </mo><mn>3</mn><mi>y</mi><mo> + </mo><mn>5</mn><mi>y</mi><mo> = </mo><mn>16</mn></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x21D2;</mo><mn>2</mn><mi>y</mi><mo>&#xA0;</mo><mo> = </mo><mo>&#xA0;</mo><mn>16</mn></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x21D2;</mo><mi>y</mi><mo> = </mo><mn>8</mn></math>
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