AlgebraEasyIntersection of a horizontal and a vertical line
Algebra practice question
In the xy-plane, the lines y = 4 and x = −2 intersect at the point (a, b). What is the value of a + b?
Answer: 2
The point is (−2, 4), so a + b = −2 + 4 = 2.
Common wrong answers
- If you answered 6
- 6 adds 4 and 2 without the sign.
- If you answered -6
- −6 has the sign wrong.
- If you answered -8
- −8 multiplies the coordinates.
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