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Pls ans very fast Q.3​ Ls:-Linear equations in two variables

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ANSWER:

let the FATHERS AGE be x years and let the sons age be y years

according to the question-

x+2y=70

2x+y=95

adding

x+2y=70

2x+y=95

3x+3y=165

x+y=165/3=55

x+y=55 (eq 1)

subtracting-

x+2y=70

2x+y=95

-x+y=-25

-(x-y)=-25

x-y=25 (eq 2)

from eq 1 and 2 we get

x+y=55

x-y=25

2x=80

x=40

putting the value of x in eq 1 we get

40+y=55

y=55-40

y=15 years

so, fathers age is 40 years and sons age is 15 years.

Step-by-step EXPLANATION:


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