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3 years ago

Choose the graph that matches the following system of equations:

Mathematics

2 answers:

V125BC [204]3 years ago

6 0

It's the lasts graph it intersects at 0,-3

Ugo [173]3 years ago

3 0

Answer:

(4) graph is correct.

Step-by-step explanation:

Given: the following system of equations:

7x + 2y = −6

6x − 7y = 21

We have to choose the correct graph for the given system of equations.

Consider the given system of equations:

7x + 2y = −6 .....(1)

6x − 7y = 21 .........(2)

Multiply (1) by 7 and (2) by 2 , we have,

( 7x + 2y = -6 ) × 7 , we have,

49x + 14y = - 42 ........(3)

( 6x − 7y = 21 ) × 2 , we have,

12x − 14y = 42 .............(4)

Add (3) and (4) , we have,

49x + 14 y + (12x - 14y)= - 42 + 42

49x + 12x = 0

x = 0

Put in (1) , we have,

7(0) + 2y = −6 ⇒ 2y = -6 ⇒ y = -3

Thus, (0, -3) is the solution.

So, (4) graph is correct.

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