Question

1) How many solutions does a linear equation in 2 variables has?
2) Find value of K if (1, 1) a solution of equation 3x - Ky = 8.
3) Calculate the edge of cube if its volume is 1331cm
4) What length of tape wil be required to hold a closed herbarium made up of
glass planes which is 30 cm long, 25 cm wide and 25 cm high?
5) Express in ax + by +c=0 from and write values of a,b,c in 3x +
y= 9.5.
6) Check it (V2,4V2) is solution of equation x - 2y = 4.
SECTION B: 3x4=12
7) A river 3m deep and 40m wide is flowing at rate of 2km/hr. How much water
will fall into sea in 30 min?
8) Give geometrical representation of 2y +7= 0 as equation in one
variable (ii) two variable.
9) The length, breadth, height of a room are 5m, 4m, 3m. Find cost of white
washing the walls and ceiling at rate of 7.50/m2
10) Capacity of cuboidal tank is 50000 lt. Find breadth of tank if its length and
depth are 2.5m, 10m.
SECTION C: 4*3=12
11) The taxi fare in a city is charged 10 for first km and at rate of 4 per km
for subsequent distance. Write linear equation to express above it and draw
graph.
12) A solid cube of 12cm is cut into eqight cubes of equal volume. What will be
the side of the new cube? Also find the ratio between their surface areas.
13) A box is to be covered with some coloured paper sheets. If the box has
length, breadth, height are 80cm, 40cm, 20cm respectively. How many
square sheets of paper of side 40cm would she require?​

Answer 1

Answer:

2.) 3x-Ky=8.

3x-(1)y=8

3x-y=8