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1. The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.

(Take the cost of a notebook to be Rs x and that of a pen to be Rs y).

(i) \(2x + 3y =9.\bar{35}\)

(ii) \(x –\frac{y}{5} – 10 = 0\)

(iii) \(–2x + 3y = 6\)

(iv) \(x = 3y\)

(v) \(2x = –5y\)

(vi) \(3x + 2 = 0\)

(vii) \(y – 2 = 0\)

(viii) \(5 = 2x\)