Algebra practice question

Answer: 3

Substitute x = 2: 14 − 2k = 8, so 2k = 6 and k = 3.

Common wrong answers

If you answered 11

11 comes from 14 − 2k = 8 solved as 2k = 22.

If you answered -3

−3 has the wrong sign; 14 − 2k = 8 gives 2k = 6.

If you answered -4

−4 is the y-intercept (x = 0), not the value at x = 2.

More Algebra questions

• Medium
  A system: 2x + y = 11 and x − y = 1. What is the value of x + y?
• Medium
  Which of the following describes all solutions to 4x − 9 ≤ 2x + 5?
• Medium
  A phone's battery percentage is modeled by P = 100 − 8t, where t is the number of hours since it was unplugged…
• Medium
  If y = 2x − 1 and 3x + y = 14, what is the value of x?
• Medium
  If |2x − 3| = 7, what is the sum of all possible values of x?
• Medium
  Line k has equation y = (2/3)x + 1. Which equation represents a line perpendicular to line k?