Eric Nicholas K's answer to Cheryl's Secondary 2 Maths Singapore question.
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For the second question, we can also substitute the second directly into the first equation because the “2y” in the first equation can be replaced by “x + 3” from the second equation, since 2y = x + 3, getting us
5x + x + 3 = 15
6x = 12
x = 2
And we continue with the second equation to get
2y = 2 + 3 = 5
y = 5/2
5x + x + 3 = 15
6x = 12
x = 2
And we continue with the second equation to get
2y = 2 + 3 = 5
y = 5/2
Date Posted:
3 years ago
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