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Solve the inequality (7x-4\le 2x+16).

Answer and explanation

Correct answer: (x\le 4)

An inequality compares two expressions and includes all values that make the comparison true. The sign 
m less than or equal to
m means that equality is also allowed, so the boundary value may be included. The important rule here is that adding, subtracting, or dividing by a positive number does not reverse the inequality sign. Only multiplication or division by a negative number would reverse it.

Start with 
m 7x-4
aisebox{0.1em}{\le}2x+16
m. Subtract 
m 2x
m from both sides to obtain 
m 5x-4
aisebox{0.1em}{\le}16
m. Add 4 to both sides: 
m 5x
aisebox{0.1em}{\le}20
m. Divide by positive 5, giving 
m x
aisebox{0.1em}{\le}4
m. Thus option A is correct; values such as 4 and 0 satisfy the inequality, while a value greater than 4 does not.

Related tags

Linear InequalitiesBasic HardClass 11

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