Which system of linear inequalities is represented by the graph?

x – 3y > 6 and y > 2x + 4
x + 3y > 6 and y > 2x – 4
x – 3y > 6 and y > 2x – 4
x + 3y > 6 and y > 2x + 4

Which system of linear inequalities is represented by the graph x 3y gt 6 and y gt 2x 4 x 3y gt 6 and y gt 2x 4 x 3y gt 6 and y gt 2x 4 x 3y gt 6 and y gt 2x 4 class=

Respuesta :

The answer is D

x + 3y > 6 and y > 2x + 4

Answer:

Option (d) is correct.

[tex]3y+x>6[/tex]  and [tex]y>2x+4[/tex]  

Step-by-step explanation:

Given : A graph

We have to choose the system of linear inequalities is represented by the graph .

Let take two points on each line

We have (0,2) and (6,0) on one line

Then equation of line is of the form y = mx + b , where, m is slope and b is y- intercept.

[tex]\mathrm{Slope}=\frac{y_2-y_1}{x_2-x_1}[/tex]

[tex]\left(x_1,\:y_1\right)=\left(0,\:2\right),\:\left(x_2,\:y_2\right)=\left(6,\:0\right)[/tex]

[tex]m=\frac{0-2}{6-0}=\frac{-1}{3}[/tex]

Thus, Equation of line is [tex]y=\frac{-1}{3}x+2[/tex]      

Simplify, we have,  

[tex]3y+x=6[/tex]        

Since, (3,2) is the point in the region so substitute, we get,

[tex]3(2)+3>6[/tex]        

Therefore, Inequality  becomes, [tex]3y+x>6[/tex]        

Similarly, for second line

We have (0,4) and (-2,0) on one line

[tex]\mathrm{Slope}=\frac{y_2-y_1}{x_2-x_1}[/tex]

[tex]m=\frac{0-4}{-2-0}=2[/tex]

Thus, Equation of line is [tex]y=2x+4[/tex]    

Since, (-3,1) is the point in the region so substitute, we get,

[tex]1>-6+4=-2[/tex]        

Therefore, Inequality  becomes, [tex]y>2x+4[/tex]  

Thus, Inequality becomes

[tex]3y+x>6[/tex]  and [tex]y>2x+4[/tex]  

                       

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