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Answers
Answer:
Q2)=Solve:
(i)=Here, the value of y is 24.
(ii)=Here, root5/3<3/root7
(iii)=Here, two solutions of X and Y are (1, 6) and (2, 5).
Q3.)=Solve:
(i)=Here, value of x=2 and of y=1.
(ii)=In this question, The present age of Priyanka is 20years and of Deepika is 14years.
Step-by-step explanation:
Q2.)Solve:
(i)=As given in question,
=6:5=Y:20
So, 6/5=Y/20
On Cross-multiplying between both, we get,
=5Y=120
=Y=120/5
=Y=24 (Answer).
(ii)=On comparing both numbers, we get,
=root5/3=3/root7
On Cross-multiplying between both, we get,
=root35 =9
Where, root35<9
So, root5/3<3/root7 (Answer).
(iii)=As given equation is,
=X+Y=7
Let here, the value of X be 1,
=1+Y=7
=Y=7-1
=Y=6
Now, by taking value of X as 2,
=2+Y=7
=Y=7-2
=Y=5
So, by this we get the solution as, (1, 6), (2, 5)
Q3.)=Solve:
(i)=As given equations are=2x+y=5, 3x-y=5
Now, by applying elimination method and adding both equations, we get,
=(2x+y=5) -(1st)eq.
=+(3x-y=5) -(2nd)eq.
So, we get, =2x+3x=5+5
=5x=10
=x=10/5
=x=2
Now, by putting value of x in (1st)eq., we get,
=2×(2)+y=5
=4+y=5
=y=5-4
=y=1 (Answer)
(ii)=Total sum of ages of Priyanka and Deepika=34years
=Priyanka is elder to Deepika by=6years
=So, Let age of Priyanka and Deepika be x and y respectively.
=Now, =x+y=34 -(1st)eq.
=x-y=6 -(2nd)eq.
Now, by applying elimination method and adding both the equations, we get,
=(x+y=34)
=+(x-y=6)
So, we get, =x+x=34+6
=2x=40
=x=40/2
=x=20
Now, By putting value of x in (1st)eq., we get,
=20+y=34
=y=34-20
=y=14.
Hence, The present age of Priyanka is 20 years and Deepika is of 14years.
Thank you.
Answer:
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Step-by-step explanation:
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