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SAT Math · Question of the Day

SAT Math Question of the Day

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Friday, August 7, 2026

A ride-share driver's earnings E(r)E(r) are linear in the number of rides rr. She earns 142 dollars for 8 rides and 233 dollars for 15 rides. If E(r)=mr+bE(r)=mr+b, what is bb?

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A ride-share driver's earnings E(r)E(r) are linear in the number of rides rr. She earns 142 dollars for 8 rides and 233 dollars for 15 rides. If E(r)=mr+bE(r)=mr+b, what is bb?

  1. 13
  2. 29
  3. 91
  4. 38 (correct answer)

Explanation: First find m=(233−142)/(15−8)=91/7=13m=(233-142)/(15-8)=91/7=13, then b=142−13⋅8=38b=142-13\cdot8=38. The 13 is the slope, 91 is the total change, and 29 is an unrelated value.