Find the value of “k” for which 7k ÷ 7-4 = 75.
Answers
Step-by-step explanation:
Consider the given equations.
2x+3y=7
(k−1)x+(k+2)y=3k
The general equations
a
1
x+b
1
y=c
1
a
2
x+b
2
y=c
2
So,
a
1
=2,b
1
=3,c
1
=7
a
2
=k−1,b
2
=k+2,c
2
=3k
We know that the condition of infinite solution
a
2
a
1
=
b
2
b
1
=
c
2
c
1
Therefore,
k−1
2
=
k+2
3
=
3k
7
⇒
k−1
2
=
k+2
3
⇒2k+4=3k−3
⇒k=7
Hence, the value of k is 7.
Answer:
Ramesh was sitting at a railway station. There, he saw a coolie, who was carrying
heavy luggage on his head. Ramesh watched him from a distance and reaches to help
him out. He helped the coolie in placing the luggage at its place. The coolie thanked
Ramesh for his kindness. Ramesh asked him to be careful in future.
(i) What work was done by the coolie on the luggage from Physics point of view?
(ii) Which values are displayed by Ramesh?