Equations in one variable | Class 8 | Practice Set 12.1

Equations in one variable | Class 8 | Practice Set 12.1

Equations in one variable Class 8 Practice Set 12.1, all the examples of this practice set are solved in the pdf file attached at the end of this article.

If you experience any problem with the opening of the pdf file then try to zoom the file to 110% or more and you should be able to open the file without any problem.

Also read : Statistics | class 10 | Practice Set 6.1

In the first question of this practice set, three values of the variable are given beside the equation, we need to put every value in the equation one by one and then we should verify whether the answer of the left hand side of the equation is exactly equal to the right hand side of the equation. If it is same for a particular value then that particular value is the solution of that equation.

In the second question we are asked to solve the equation. For solving the equation we should try to keep the variable on one side preferably left hand side and should perform appropriate mathematical operations to find the solution of the given variable.

Also read : Statistics | class 10 | Practice Set 6.2

Practice Set 12.1

1. Each equation is followed by the values of the variable. Decide whether
   these values are the solutions of that equation.
   (1) x – 4 = 3 , x = -1, 7, -7 (3) 2a + 4 = 0, a = 2, -2, 1 (2) 9m = 81, (4) 3 – y = 4, m = 3, 9, -3
   y = -1, 1, 2
2. Solve the following equations.
   (1) 17p – 2 = 49 (2) 2m + 7 = 9 (3) 3x + 12 = 2x – 4
   (4) 5(x – 3) = 3(x + 2) (5) 9
   x + 1 = 10 (6) y
   3 = 2
   (7) 13x – 5 = 3
   2 (8) 3(y + 8) = 10(y – 4) + 8 (9) x
3. (10) y− 4

• 3y = 4 (11) b + + + + (b ) (b ) 12

Practice-Set-12.1