**Question 1.Fill in the blanks of the following.**

Solution:

**Question 2.5m – n = 3m + 4n, then find the values of the following expressions.Solution:**

5m – n = 3m + 4n … [Given]

∴ 5m – 3m = 4n + n

∴ 2m = 5n

**Question 3.Solve:Solution:**Here, no two of a, b and c are equal.

∴ values of (b – c), (c – a) and (a – b) are not zero.

a(y + z) = b(z + x) = c(x + y) … [Given]

Solution:

Solution:

Solution:

Solution:

**Question 4.Solve:Solution:**

∴ 7(4x – 5)3(2x + 3)

∴ 28x – 35 = 6x + 9

∴ 28x – 6x = 9 + 35

∴ 22x = 44

∴ x = 2

∴ x = 2 is the solution of the given equation.

ii. 5*y*2+40*y*−125*y*+10*y*2−4=*y*+81+2*y*

∴ y + 8 = 3(1 + 2y)

∴ y + 8 = 3 + 6y

∴ 8 – 3 = 6y – y

∴ 5 = 5y

∴ y = 1

∴ y = 1 is the solution of the given equation.