87=5y^2

Solution for 87=5y^2 equation:

Simplifying
87 = 5y2

Solving
87 = 5y2

Solving for variable 'y'.

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

Add '-5y2' to each side of the equation.
87 + -5y2 = 5y2 + -5y2

Combine like terms: 5y2 + -5y2 = 0
87 + -5y2 = 0

Add '-87' to each side of the equation.
87 + -87 + -5y2 = 0 + -87

Combine like terms: 87 + -87 = 0
0 + -5y2 = 0 + -87
-5y2 = 0 + -87

Combine like terms: 0 + -87 = -87
-5y2 = -87

Divide each side by '-5'.
y2 = 17.4

Simplifying
y2 = 17.4

Take the square root of each side:
y = {-4.171330723, 4.171330723}