Join your school's WhatsApp group
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709

If 4x+2y=16 and 6x-2y=4 , find the value of (y-x).

Mathematics
WAEC 2021

If 4x+2y=16 and 6x-2y=4 , find the value of (y-x).

  • A. 8
  • B. 2
  • C. 4
  • D. 6
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Correct Answer: Option B
Explanation

Using elimination method:

4x+2y=16 * 6 --> 24x +12y=96 ... eqn iii

6x-2y=4  * 4 --> 24x - 8y = 16 ... eqn iv

Subtract eqn iv from iii

20y = 80

y = 4

Subst. y for 4 in 4x + 2y = 16

--> 4x + 2(4) = 16

--> 4x = 16 - 8

--> 4x = 8

--> x = 2

: The value of (y-x) is 4 - 2 = 2

 


Report an Error Ask A Question Download App
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group