Question Solve the equation r=21 Evaluate 3r=7Cross multiply r=3×7Solution r=21 Show Solution Rewrite the equation x2+y2=441 Evaluate 3r=7Simplify the expression 31r=7Multiply both sides of the equation by LCD 31r×3=7×3Simplify the equation r=7×3Simplify the equation r=21Square both sides of the equation r2=212To covert the equation to rectangular coordinates using conversion formulas,substitute x2+y2 for r2 x2+y2=212Solution x2+y2=441 Show Solution Graph
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