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RD Chapter 7- Introduction to Euclid-s Geometry Ex-7.3 Interview Questions Answers

Question 1 : Draw the graph of each of the following linear equations in two variables.

Answer 1 :

(i)x + y = 4
x = 4 – y
If y = 0, then x = 4
If y = 4, then x = 0
Now plot the points (4, 0) and (0, 4) on the graph and join them ro get the graph of the given equation
(ii)x – y = 2
x = 2 +y
If y = 0, then x = 2 and if y = 1,
Then x = 2 + 1 = 3
 
Now plot the points (2, 0) and (3, 1) on the graph and join them to get the graph of the equation.
(iii) -x+y = 6 ⇒  y = 6+x
 
If x = 0, then y = 6 + 0 = 6
If x = -1, then y = 6 – 1 = 5
Now plot the points (0, 6) and (-1, 5) on the graph and join them to get a graph of the line.
(iv) y = 2x
If x = 0, then y =  2 x 0 = 0
If x = 1, then y = 2 x 1 = 2