Solving Simulataneous equations

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To solve the simultaneous equations D.17 and D.18, start by isolating one variable, such as η_g, in the first equation. Substitute this expression into the second equation to form a quadratic equation. From there, apply standard methods for solving quadratic equations to find the values of the variables. This approach effectively simplifies the problem and leads to a solution. Utilizing substitution is a key strategy in solving simultaneous equations.
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Homework Statement



Hi Friends.

Please help me solving two simultaneous equations...
Equations are attached as Jpeg files...

How to solve these two equations(D.17 & D.18) ?? please help me

By SMSS

Homework Equations





The Attempt at a Solution

 

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Solve the first one for \eta_g, substitute in the second equation. You get a quadratic equation.
 
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