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?

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?
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?

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?
一楼请不要答非所问
这个是个function,because according to the definition of a function each value of x can only have one corresponding vaule of y..在题目中每个x value只有一个y vaule ,所以这个是function

determine if the second funtion is the inverse of the first function y y=2x^2-3, X<=0 这个时候要注意y的取值范围是 [-3，无穷）