AN Tutor's answer to Vera's Primary 6 Maths Algebra Singapore question.
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Date Posted:
5 years ago
Vera, I have left a non-algebra method in the main comments section. Do take a look
Thank you!
Thank you!
Welcome
Hi, may I know why you did y/3 - 2y = - 70 - y/3 = - 70
I don’t understand where you got 70 from, sorry. Please let me know, thanks!
I don’t understand where you got 70 from, sorry. Please let me know, thanks!
160 - 2y + y/3 = 85
160 - 5/3 y = 85
160 - 160 - 5/3 y = 85 - 160
-5/3 y = -75
y = -75 x -3/5
y = 45
The two sides of the equation are equal to each other (that's why it's called equation, because it equates one quantity to another)
When you subtract 160 from the left hand side, you got to subtract 160 from the right hand side as well.
160 - 5/3 y = 85
160 - 160 - 5/3 y = 85 - 160
-5/3 y = -75
y = -75 x -3/5
y = 45
The two sides of the equation are equal to each other (that's why it's called equation, because it equates one quantity to another)
When you subtract 160 from the left hand side, you got to subtract 160 from the right hand side as well.
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