please answer me my question teniteraj bro in maths
Answers
Step-by-step explanation:
8)
Let the two numbers be X and Y
X> Y
The sum of two numbers = 20
=> X+Y = 20 --------(1)
If twice the X is 13 more than the Y
=> 2X = Y+13
=> 2X-Y-13 = 0 -------(2)
9)
Given equation is 2x-7y = 14
Put x = 0 then 2(0)-7y = 14
=> -7y = 14
=> y = 14/-7 = -2
The point = (0,-2)
Put y = 0 then 2x-7(0) = 14
=> 2x = 14
=> x = 14/2 = 7
Point = (7,0)
Put x = 1 then 2(1)-7y = 14
=> 2-7y = 14
=> -7y = 14-2
=> -7y = 12
=> y = 12/-7
=> y = -12/7
Point = (1,-12/7)
Put y = 2 then 2x-7(2) = 14
=> 2x-14 = 14
=> 2x = 14+14
=> 2x = 28
=> x = 28/2
=> x = 14
Point = (14,2)
Put x = 8 then 2(8)-7y= 14
=> 16-7y = 14
=> -7y = 14-16
=> -7y = -2
=>y = -2/-7
=> y = 2/7
The point = (8,2/7)
10)
Given equation is 3a+b = 8
Given point = (19/9,5/3)
Put a = 19/9 and b = 5/3 in LHS of the given equation then
=> 3(19/9)+(5/3)
=> (19/3)+(5/3)
=> (19+5)/3
=> 24/3
=> 8
=] RHS
=> LHS = RHS
Given point satisfies the given equation
It is a solution of the given equation
11)
The constant rent = Rs. x
The charge of each call = Rs. y
The cost of 100 calls = Rs.270
=> x + 100y = 270
=> x+100y-270 = 0-----(1)
and
The cost of 150 calls = Rs. 345
=> x+150y = 345
=> x+150y-345 = 0----(2)
12) See the attachment
13)
Given equation is y+5 = 0
It is an equation in one variable
and it can be written as
0x + y + 5 = 0
It is an equation in two variables
14)
See the above attachment
15)
Given that
Energy of the body is directly proportional to the height of the body
=> E is Proportional to H
=> E = HK
Where K is a constant
=> E / H = K
Given that
E = 10m and H = 1000 units
=> 1000 /10 = K
=> 100 = K
The equation becomes = E/H = 100
=> E = 100H
=> E -100 H = 0
See the above attachment
