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What is the solution of (7-3x\ge 1)?

Answer and explanation

Correct answer: (x\le 2)

The direct answer is option A: x≤2. Start with 7-3x≥1. Subtract 7 from both sides: -3x≥-6. Divide by -3; because the divisor is negative, reverse the sign: x≤2. A is correct. Check the boundary x=2: 7-3(2)=1, so 1≥1 is true and 2 must be included. B, x≥2, has the wrong direction caused by failing to reverse the sign. C, x≤-2, has the wrong boundary and does not describe the result; for example, x=0 satisfies the original inequality since 7≥1, but C excludes 0. D, x≥-2, also has the wrong direction and includes x=3, which gives 7-9=-2≥1, false. The minus coefficient of x is the key detail. Memory cue: when isolating a variable by dividing by a negative coefficient, turn ≥ into ≤.

Related tags

Linear-InequalitiesSign-ChangeClass-11Easy

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