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Emily
Emily

Form 1 chevron_right Malaysia

Anyone help pls?

Date Posted: 5 years ago
Views: 351
Eric Nicholas K
Eric Nicholas K
5 years ago
3x - 4y = 33 (Eq. 1)
2x + y = 11 (Eq. 2)

You can solve such pair of simultaneous equations in two variables by three methods. Elimination, substitution and, if you like, graphical.

I will do the substitution approach here.

From equation 2, making y the subject,

y = 11 - 2x (Eq. 3)

Substituting Eq. 3 into Eq. 1,

3x - 4y = 33
3x - 4 (11 - 2x) = 33
3x - 44 + 8x = 33
11x = 77
x = 7

Substituting x = 7 into Eq. 3,

y = 11 - 2x
y = 11 - 2 (7)
y = -3

So, x = 7 and y = 3

[Check]

(Eq. 1)

3x - 4y
= 3 (7) - 4 (-3)
= 21 + 12
= 33

(Eq. 2)

2x + y
= 2 (7) + (-3)
= 14 - 3
= 11

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Bendy
Bendy's answer
57 answers (Tutor Details)
1st
Remember there are 2 ways to solve. Elimination or substitution