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secondary 2 | Maths
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Piranha
Piranha

secondary 2 chevron_right Maths chevron_right Singapore

Please help me thanks in advance

Date Posted: 3 months ago
Views: 31
snell
Snell
3 months ago
instruction says : Use simultaneous eqns to solve

unit digit: x
tens digit: y

x+y = 12 ... ... ... [1]
x = 2y ... ... ... [2]

subst. [2] into [1],
3y = 12
y = 4

x = 8

number is 48


...

[ extra: use pri method ]

unit digit : 2u
tens digit : u

2u+u = 12
u = 4

no. is 48.


...

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Claudine Lim
Claudine Lim's answer
16 answers (Tutor Details)
1st
tip: u can try writing out the number using the unknown to visualise how the number should look like