121r^2-81t^2=0

Solution for 121r^2-81t^2=0 equation:

Simplifying
121r2 + -81t2 = 0

Solving
121r2 + -81t2 = 0

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '81t2' to each side of the equation.
121r2 + -81t2 + 81t2 = 0 + 81t2

Combine like terms: -81t2 + 81t2 = 0
121r2 + 0 = 0 + 81t2
121r2 = 0 + 81t2
Remove the zero:
121r2 = 81t2

Divide each side by '121'.
r2 = 0.6694214876t2

Simplifying
r2 = 0.6694214876t2

Take the square root of each side:
r = {-0.818181818t, 0.818181818t}