Question

1) State with reason whether the equation -3

2− 7y = 13 is a linear

equation with two variables?

2) Show the condition using variable x and y: Two numbers differ by 3

3) For the equation 4x + 5y = 20 find y when x = 0

4) Write any two solutions of the equation x + y = 7.

5) Decide whether (0, 2) is the solution of the equation 5x + 3y = 6

6) Write any two solution of the equation a – b = - 3

7) If x+2y=5 and 2x+y=7 then find the value of x+y

8) If Dx = 24 and x = - 3 then find the value of D.

9) The cost of the book is 5 rupees more than twice the cost of a pen. Show

this using linear equation by taking Cost of book(x) and cost of a pen(y).

10) If

4

+

3

= 4, write the equation in standard form​

Answer 1

Answer:

1) no it is not a linear equations into two variable because in linear equations x and y are both in equations but in this equation x is not given.

2) when 3/1 it is two numbers which differs from 3

3 and 1.

3) 4x+5y=20

when x=0

4(0)+5=20

0+5y=20

5y=20

y=20/5

y=4

4) if x=0 then y=7

if x=1 then y=6

5) yes it is a solution of equation

because when we put 5(0)+3(2)=6

we get, 0+6=6

6-6=0

6) if a=0 then b=3

if a=1 then b=2

7) from equation 1 we get x=5-2y

put this in equation 2

we get, y=1

by putting the value of y in equation 1

we get, x=3

now, x+y

3+1=4

8) the value of D is (-8)

9) sorry I don't know answer

10) This question is wrong