4-2.Quadratic Equations and Inequations
normal

ધારો કે $x$ અને $y$ એ ધન સંખ્યાઓ છે કે જેથી $xy = \frac{1}{9};\,x\left( {y + 1} \right) = \frac{7}{9};\,y\left( {x + 1} \right) = \frac{5}{{18}}$ થાય તો $(x + 1) (y + 1)$ ની કિમત મેળવો 

A

$\frac {8}{9}$

B

$\frac {16}{9}$

C

$\frac {10}{9}$

D

$\frac {35}{18}$

Solution

$x(y+1) y(x+1)=\frac{7}{9} \times \frac{5}{18}$

$\frac{1}{9}(x+1)(y+1)=\frac{7 \times 5}{9 \times 18}$

$\Rightarrow \quad(x+1)(y+1)=\frac{35}{18}$

Standard 11
Mathematics

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