Question

(A) 6
15. The la
(A) x
3.9 Gr
3.9.1 In
Exercise 3.7
1. Fill in the blanks:
(i) The solution of the equation ax+b=0 is
(ii) If a and b are positive integers then the solution of the equation ax=b has to be
always
(iii) One-sixth of a number when subtracted from the number itself gives 25. The num)
is
(iv) If the angles of a triangle are in the ratio 2:3:4 then the difference between the
and the smallest angle is
(v) In an equation a + b = 23. The value of a is 14 then the value of b is
2. Say True or False
(i) “Sum of a number and two times that number is 48" can be written as y+2y = 48
(ii) 5(3x+2) = 3(5x-7) is a linear equation in one variable.
The
grea
Descart
his bed,
at vario
the plac
he drer
horizo
lines,
of the
in the
(iii) x = 25 is the solution of one third of a number is less than 10 the original number
1
of its breadth. If its perimeter is 64m, then find the leng
place
(x) ir
case
3. One number is seven times another. If their difference is 18, find the numbers.
4. The sum of three consecutive odd numbers is 75. Which is the largest among them
5. The length of a rectangle is
3
and breadth of the rectangle.
6. A total of 90 currency notes, consisting only of 75 and 10 denominations, amount a
500. Find the number of notes in each denomination.
7. At present, Thenmozhi's age is 5 years more than that of Murali's age. Five years ago
3.9.​

Answer 1

The solution to the equation ax = b is x = `"b"/"a"` is also positive.