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secondary 2 | Maths
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How to do this question using substitution method. Thanks.
Date Posted: 3 years ago
Views: 230
2x - 7y = 5 --> Eq 1
3x + y = -4 --> Eq 2
From Eq 2,
y = -4 - 3x --> Eq 3
Sub Eq 3 into Eq 1
2x - 7 (-4 - 3x) = 5
2x + 28 + 21x = 5
2x + 21x = 5 - 28
23x = -23
x = -1
Sub x = -1 into Eq 3
y = -4 - 3 (-1)
y = -1
So, x = -1. y = -1
3x + y = -4 --> Eq 2
From Eq 2,
y = -4 - 3x --> Eq 3
Sub Eq 3 into Eq 1
2x - 7 (-4 - 3x) = 5
2x + 28 + 21x = 5
2x + 21x = 5 - 28
23x = -23
x = -1
Sub x = -1 into Eq 3
y = -4 - 3 (-1)
y = -1
So, x = -1. y = -1
See 1 Answer
done
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clear
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Make x the subject, equate the two and solve for y then x
Date Posted:
3 years ago
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