![For the numbers 2 through 9 on a telephone keypad (see figure), create two relations: one mapping numbers onto letters, and the other mapping letters onto numbers. Are both relations? functions? Explain. For the numbers 2 through 9 on a telephone keypad (see figure), create two relations: one mapping numbers onto letters, and the other mapping letters onto numbers. Are both relations? functions? Explain.](https://homework.study.com/cimages/multimages/16/20220613_115149-redex2848725783641306812.png)
For the numbers 2 through 9 on a telephone keypad (see figure), create two relations: one mapping numbers onto letters, and the other mapping letters onto numbers. Are both relations? functions? Explain.
![Rotary Phone Dial With Numbers And Letters Royalty Free SVG, Cliparts, Vectors, And Stock Illustration. Image 14322095. Rotary Phone Dial With Numbers And Letters Royalty Free SVG, Cliparts, Vectors, And Stock Illustration. Image 14322095.](https://previews.123rf.com/images/yupiramos/yupiramos1207/yupiramos120700102/14322095-rotary-phone-dial-with-numbers-and-letters.jpg)
Rotary Phone Dial With Numbers And Letters Royalty Free SVG, Cliparts, Vectors, And Stock Illustration. Image 14322095.
![Application For Phone Number Change in School - Request Letter For Change Cell Phone Number - YouTube Application For Phone Number Change in School - Request Letter For Change Cell Phone Number - YouTube](https://i.ytimg.com/vi/g37qKBvs0gE/maxresdefault.jpg)
Application For Phone Number Change in School - Request Letter For Change Cell Phone Number - YouTube
![Keyboard with numbers and letters on the phone screen. User interface keyboard for smartphone. Keyboard template on a touch device. Vector illustratio Stock Vector Image & Art - Alamy Keyboard with numbers and letters on the phone screen. User interface keyboard for smartphone. Keyboard template on a touch device. Vector illustratio Stock Vector Image & Art - Alamy](https://c8.alamy.com/zooms/6/7c033e37432c4636a2b5a479b55423a6/2et7enb.jpg)
Keyboard with numbers and letters on the phone screen. User interface keyboard for smartphone. Keyboard template on a touch device. Vector illustratio Stock Vector Image & Art - Alamy
![Keypad with numbers and letters for phone. User interface keypad for smartphone. Keyboard template in touchscreen device. Vector illustration EPS 10. vector de Stock | Adobe Stock Keypad with numbers and letters for phone. User interface keypad for smartphone. Keyboard template in touchscreen device. Vector illustration EPS 10. vector de Stock | Adobe Stock](https://as1.ftcdn.net/v2/jpg/02/03/89/00/1000_F_203890040_1ERcQTrf5KzvB69lKuBdbYSIGWgpQGaI.jpg)
Keypad with numbers and letters for phone. User interface keypad for smartphone. Keyboard template in touchscreen device. Vector illustration EPS 10. vector de Stock | Adobe Stock
![Smartphone dial keypad with numbers and letters. Interface keypad for touchscreen device. Dialing numbers phone on screen. Mobile phone keypad design. Vector Illustration. vector de Stock | Adobe Stock Smartphone dial keypad with numbers and letters. Interface keypad for touchscreen device. Dialing numbers phone on screen. Mobile phone keypad design. Vector Illustration. vector de Stock | Adobe Stock](https://as2.ftcdn.net/v2/jpg/04/09/51/23/1000_F_409512330_e8kUIjkqqiVSER8Zd2oEzXZjIlO9aOe4.jpg)
Smartphone dial keypad with numbers and letters. Interface keypad for touchscreen device. Dialing numbers phone on screen. Mobile phone keypad design. Vector Illustration. vector de Stock | Adobe Stock
![Premium Vector | Smartphone dial keypad icon keypad number and letters for telephone illustration symbol sign app button vector Premium Vector | Smartphone dial keypad icon keypad number and letters for telephone illustration symbol sign app button vector](https://img.freepik.com/premium-vector/smartphone-dial-keypad-icon-keypad-number-letters-telephone-illustration-symbol-sign-app-button-vector_744955-476.jpg?w=2000)
Premium Vector | Smartphone dial keypad icon keypad number and letters for telephone illustration symbol sign app button vector
![The letters and the numbers for the phone number on this commercial don't match up when typed. : r/mildlyinteresting The letters and the numbers for the phone number on this commercial don't match up when typed. : r/mildlyinteresting](https://external-preview.redd.it/xou_JPq65CpufxS2UoN6_4sV-hz2psN6eeW1s52JAzA.png?auto=webp&s=ea2c53c13fb8e80652712759fbb9ba5e1a29363d)
The letters and the numbers for the phone number on this commercial don't match up when typed. : r/mildlyinteresting
![The standard 12-key telephone keypad, character layout follows the ITU... | Download Scientific Diagram The standard 12-key telephone keypad, character layout follows the ITU... | Download Scientific Diagram](https://www.researchgate.net/publication/221518150/figure/fig1/AS:305488823635968@1449845619238/The-standard-12-key-telephone-keypad-character-layout-follows-the-ITU-E161-standard-8.png)