Solve for v
v\leq 20
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4\times 5\geq v
Multiply both sides by 5. Since 5 is positive, the inequality direction remains the same.
20\geq v
Multiply 4 and 5 to get 20.
v\leq 20
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
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Linear equation
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Matrix
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Simultaneous equation
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Limits
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