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primary 6 | Maths | Algebra
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Bliss
Bliss

primary 6 chevron_right Maths chevron_right Algebra chevron_right Singapore

Hi teachers, are the steps done correctly?

Date Posted: 3 months ago
Views: 125
sstrike
Sstrike
3 months ago
no
Bliss
Bliss
3 months ago
Should be -3y

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Mimosa
Mimosa's answer
1615 answers (A Helpful Person)
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Bliss
Bliss
3 months ago
Thank you!
Eric Nicholas K
Eric Nicholas K
3 months ago
Bliss, also note that the final line is invalid.

4xy + 20x - 12y does not become xy + 5x - 3y, since 4xy + 20x - 12y is an expression (rather than an equation). Factorisation would be good here.

4xy + 20x - 12y = 4 (xy + 5x - 3y)

In an equation, we can remove this “4” because the equation remains valid if we perform the same mathematical operation on both sides.

4xy + 20x - 12y = 0
4 (xy + 5x - 3y) = 0

Dividing both sides of the equation by 4,
xy + 5x - 3y = 0 (because 0 divided by 4 is 0)

More curiously, I am wondering how this could be a P6 level question - this is too advanced for a P6 student.
Bliss
Bliss
3 months ago
Exactly. I find this difficult for p6 & wondering if these kind of questions will be tested. Question source from tution center