Question

the sum of the ages of tina and
rina is 20 years while the difference between
their age is 4 years write the pair of linear
equation
Please urgen

Answer 1

Step-by-step explanation:

If,

Tina = x

Rina = y. Then,

x+y=20

x-y=4

Answer 2

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Given :-

Sum of age of two friends is 20 years.

Let ,

Age of first friend be x

Age of second friend =20-x

Four years ago:-

age of 1st friend = x - 4✔

Age of 2nd friend = (20 - x) - 4 =16 - x✔

Product of the age of two friends = 48 years :-

According to question

=> (x - 4) (16 - x) = 48

=> x (16 - x) - 4 (16 - x) = 48

=> 16x - x² - 64 + 4x = 48

=>- x² + 16x + 4x - 64 - 48= 0

=> - x² +20x - 112 = 0

=> x² - 20x + 112 = 0

Comparing the equation with ax² + bx + c = x² - 20x + 112

Here

a = 1

b = -20

c = 112

Now we will used discriminant formula :-

D = b² - 4ac

=> (-20)² - (4 × 1 × 112)

=> 400 - 448

=> - 48

(D < 0 )i.e D is less than 0 its mean it have no real roots

Hence,

It is not possible to find the present age.