SAT Math · Linear inequalities in one or two variables · medium

Which of the following is equivalent to -2(x-3) > 10?

Which of the following is equivalent to −2(x−3)>10-2(x-3) > 10?

Answer and explanation

Answer: B: x < -2

Distribute: −2(x−3)=−2x+6-2(x - 3) = -2x + 6, so the inequality is −2x+6>10-2x + 6 > 10. Subtract 6: −2x>4-2x > 4. Divide both sides by −2-2 and reverse the inequality sign: x<−2x < -2, choice B. Test x=−3x = -3: −2(−6)=12>10-2(-6) = 12 > 10, which is true. Choice A (x>−2x > -2) divides by −2-2 but fails to reverse the sign. Choices C (x<8x < 8) and D (x>8x > 8) do not follow from valid steps: x=0x = 0 fails −2(x−3)>10-2(x-3) > 10 because 6<106 < 10, and x=9x = 9 fails because −12<10-12 < 10. Multiplying or dividing by a negative flips the inequality.

More Linear inequalities in one or two variables questions

All Linear inequalities in one or two variables questions

Learn the method behind questions like this one

The SAT Math course teaches each tested skill through lessons, step-by-step solutions to sample problems, the complete study guide and full-length practice tests.