Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 2 | Maths
2 Answers Below
Anyone can contribute an answer, even non-tutors.
How to do this using elimination method. Thanks.
Date Posted: 3 years ago
Views: 182
Observe that the "3y" are the same and they appear as minuses. So, we subtract both equations.
Equation 2 - Equation 1 gives
(11x - 3y) - (7x - 3y) = 21 - 15
4x = 6
x = 3/2
Sub back into Eq 1,
7 (3/2) - 3y = 15
21/2 - 3y = 15
21/2 - 15 = 3y
-9/2 = 3y
-3/2 = y
Equation 2 - Equation 1 gives
(11x - 3y) - (7x - 3y) = 21 - 15
4x = 6
x = 3/2
Sub back into Eq 1,
7 (3/2) - 3y = 15
21/2 - 3y = 15
21/2 - 15 = 3y
-9/2 = 3y
-3/2 = y
See 2 Answers
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hope this helps
Date Posted:
3 years ago
360 Tutoring Program