Question 3 • EF Math 12 1st Nine Weeks
A relation is a function if every input x is paired with exactly one output y. Here, each x value (−3, −2, −1, 0, 1, and 2) is paired with only y = 5, so the relation is a function. Choice b states this rule: “For every x value, there is only one y value — a function.”
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