Out of 4 variables in 2 equations, i need the calculator to solve only for the selected 2 variables. how do i do that?
First select Equation from the drop-down menu you get when you click on the 3 dots near the word Scientific:
Next select 2 variables 2 equations from the menu near the upper right:
Then enter your two equations using x and y for the ones you want to solve for. You could use r1 and r2 for the others, but using something like a and b works as well as can be seen below