The tip
On Digital SAT systems questions, read what they actually ask for. If they want x + y, you may not need each value separately, and Desmos can graph both lines in seconds to check your work.
Try it
If 3x + 2y = 16 and x - 2y = 0, what is the value of x + y?
- A4
- B5
- C6
- D8
Reveal answer
Answer: C. 6
From x - 2y = 0, x = 2y. Substitute: 3(2y) + 2y = 8y = 16, so y = 2 and x = 4. Then x + y = 6. Check: 3(4) + 2(2) = 16 and 4 - 2(2) = 0.
Go deeper: What's on the SAT Math section (College Board)
Not sure where your student stands? Book a free full-length diagnostic at Parsippany or Bridgewater.
Free diagnostic
or call (973) 566-5193