2. Check whether the value given in the brackets is a solu
or not
(a) n+ 5 = 19 (n = 1) (b) In + 5 = 19 (n = -2)
(d) 4p - 3 = 13 (p = 1) (e) 4p - 3 = 13 (p = - 4)
Solve the following equations by trial and error method
0 6p + 4 = 17 (ii) 3m - 14 = 4
Write equations for the following statements:
The sum of numbers and 4'is 9.) 2 subtri
Gil
) Ten times a is 70
(iv) The nu
(v) Three fourth ofis 15.
(vi)eight
Answers
Answer:
(a) n+ 5 = 19 (n = 1)
if n is 1
1+5=19
6≠19
so value given in the brackets is not a solution
(b) n + 5 = 19 (n = -2)
-2+5=19
3≠19
so value given in the brackets is not a solution
(d) 4p - 3 = 13 (p = 1)
4(1)-3=13
4-3=13
1≠13
so value given in the brackets is not a solution
(e) 4p - 3 = 13 (p = - 4)
4(-4)-3=13
-16-3=13
-19≠13
so value given in the brackets is not a solution
(i)6p + 4 = 17
6(1)+4=16
10≠16
6(2)+4=16
16=16
therefore p is 2
(ii) 3m - 14 = 4
3(1) - 14 = 4
-11≠4
3(2) - 14 = 4
-8≠4
3(3) - 14 = 4
-5≠4
3(4) - 14 = 4
-2≠4
3(5) - 14 = 4
1≠4
3(6) - 14 = 4
4=4
therefore p=6
1. The sum of numbers and 4
let the 2 numbers be a and b
a+b=4
2. Ten times a is 70
10a=70
3. Three fourth of a number is 15.
let the number be a