英语的数学题Determine if the relation is a function. 25) {(-7, 2), (-4, -3), (-2, 9), (2, 7)}怎么做?

问题描述:

英语的数学题Determine if the relation is a function. 25) {(-7, 2), (-4, -3), (-2, 9), (2, 7)}
怎么做?