ANSWER
C) (6,-8)
EXPLANATION
The equations are:
and
We substitute the first equation into the second equation to get:
We multiply through by 3 to get:
Group similar terms,
Divide both sides by 7 to get,
Put this value of x into the first equation to get;
The function f(x) is less than 0 at x < -1.8
<h3>How to analyze the graph?</h3>The missing graph is added as an attachment
The interval where f(x) < 0 are the intervals where the y value of the function is less than 0.
This in other words, represent the negative y-axis
From the attached graph, the function f(x) is less than 0 at x < -1.8.
This extends till x = infinity
Hence, the function f(x) is less than 0 at x < -1.8
Read more about function interval at:
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