Question

Which equation could be used to solve the following system?

Answer 1

we have

$x+y=11$

$x=11-y$ --------> equation A

$4x^{2} -3y^{2}=8$ ----> equation B

Substitute equation A in equation B

$4(11-y)^{2} -3y^{2}=8$

therefore

the answer is the option B

$4(11-y)^{2} -3y^{2}=8$

Answer 2

I hope this helps you




x=11-y




4. (11-y)^2-3y^2=8