(Wave)Ellie said:how do u make x the subject in
y=2x squared +3
Ellie said:how do you make x the subject in
y=\sqrt{xover3
Perhaps you had already noticed this, and I would agree that it is good to point out \(\displaystyle y \geq 3\) anyway, but I should point out that this condition is satisfied by the given equation.evinda said:(Wave)
$y= 2x^2+3 \Rightarrow 2x^2=y-3 \Rightarrow x^2=\frac{y-3}{2} \Rightarrow x= \pm \sqrt{\frac{y-3}{2}}$
Notice that it has to be $y-3 \geq 0 \Rightarrow y \geq 3$.
To change the subject in two equations, you need to follow the steps of solving a system of equations. Start by isolating one variable in one equation and substitute its value into the other equation. Then, solve for the remaining variable. Finally, substitute the value of the second variable into the first equation to find the value of the original subject.
Yes, you can make any variable the subject in two equations as long as the two equations contain both variables. If one of the equations does not have the variable you want to make the subject, you will need to rearrange the equations to include it.
No, you do not always have to solve for both variables. If one of the equations only has one variable, you can simply substitute its value into the other equation and solve for the remaining variable.
If you have more than two equations, you can still make a specific variable the subject by using the same steps as solving a system of equations. You will need to isolate the desired variable in one equation and substitute its value into the other equations until you have only one equation left with the variable you want as the subject.
Yes, you can use this method to solve for multiple variables at once. If you have more than two equations, you will need to continue substituting the values of the solved variables into the remaining equations until you have solved for all the desired variables.