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tiny-mole [99]
3 years ago
11

What is the solution (a, c) to this system of linear equations?

Mathematics
2 answers:
tangare [24]3 years ago
8 0

Answer:  The correct option is

(C) (3, 4).

Step-by-step explanation:  We are given to find the solution (a, c) to the following system of linear equations :

2a-3c=-6~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\\\\a+2c=11~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(ii)

Multiplying equation (ii) by 2, we have

2(a+2c)=2\times11\\\\\Rightarrow 2a+4c=22~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(iii)

Subtracting equation (i) from (iii), we get

(2a+4c)-(2a-3c)=22-(-6)\\\\\Rightarrow 7c=28\\\\\Rightarrow c=\dfrac{28}{7}\\\\\Rightarrow c=4.

From equation (i), we get

2a-3\times4=-6\\\\\Rightarrow 2a=12-6\\\\\Rightarrow 2a=6\\\\\Rightarrow a=\dfrac{6}{2}\\\\\Rightarrow a=3.

Thus, the required solution is (a, c) = (3, 4).

Option (C) is CORRECT.

weeeeeb [17]3 years ago
4 0
This is how you do it :) let me know if you have any questions. Hope this helps :)

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Given

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