Finding Composite and Inverse Functions · Try It 5

For each set of ordered pairs, determine if it represents a function and if so, is the function one-to-one.
ⓐ $\left\{\left(-3,-6\right),\left(-2,-4\right),\left(-1,-2\right),\left(0,0\right),\left(1,2\right),\left(2,4\right),\left(3,6\right)\right\}$ ⓑ $\left\{\left(-4,8\right),\left(-2,4\right),\left(-1,2\right),\left(0,0\right),\left(1,2\right),\left(2,4\right),\left(4,8\right)\right\}$

OpenStax, Intermediate Algebra 2e · §10.1 Finding Composite and Inverse Functions · Try It 5