AlgebraEasy–MediumMissing coordinate on a line in standard form
Algebra practice question
The line 5x − 2y = −4 passes through the point (−2, k). What is the value of k?
Answer: -3 or −3
Substitute x = −2: −10 − 2k = −4, so −2k = 6 and k = −3.
Common wrong answers
- If you answered 2
- 2 is the y-intercept (x = 0), not the value at x = −2.
- If you answered 3
- 3 has the wrong sign; −2k = 6 gives k = −3.
- If you answered -7
- −7 comes from −10 − 2k = −4 solved as −2k = 14 (adding 10 with the wrong sign).
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