Question

The values of ‘ x ’ and ‘ y ’ when a point lies on the linear equation 3x - 5y = 21
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Answer 1

Answer:

(0, -21/5), (1, -18/5) and so on...

Explanation:

x=0 => -5y=21 => y= -21/5

x=1 => 3-5y=21 => y = -18/5

Hope this helps. Have a great day. :)

Answer 2

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).
Sol: Let the cost of a notebook = Rs x
The cost of a pen = y
According to the condition, we have
[Cost of a notebook] = 2 × [Cost of a pen]
i.e. [x] = 2 × [Y]
or x = 2y
or x – 2y = 0
Thus, the required linear equation is × – 2y = 0.