r=0 is the solution...
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5r = 25 is a linear equation in one variable, r. The solution is r = 5.
To solve the equation 6r + 2 = 2, you need to isolate the variable r. Start by subtracting 2 from both sides of the equation. This will give you 6r = 0. To solve for r, divide both sides of the equation by 6. The solution is r = 0.
Divide both sides by 6: 3 - r = 0, so r = 3 satisfies the equation.
A circle centre (0, 0) and radius r has equation x² + y² = r² The circle x² + y² = 36 has: r² = 36 → radius = 6
It's a linear equation in 'r' . Here's how to find the solution:16 - r = -16Add 16 to each side of the equation:32 - r = 0Add 'r' to each side:32 = r