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What is the inequality shown in the graph?

10x – y < 1
0.1x – y < 1
0.1x – y > 1
10x – y > 1

C. is the answer

What is the inequality shown in the graph? 10x – y < 1 0.1x – y < 1 0.1x – y-example-1
User Mathmike
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2 Answers

1 vote

Answer:

C

Explanation:

User Zedfoxus
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4 votes

Answer:

0.1x – y > 1

Explanation:

The boundary line has a small positive slope (rise over run), so the inequality will be 0.1x + ... rather than 10x + ....

The graph is shaded to the right of the boundary line, so for x values greater than those on the line. That means the inequality is ...

0.1x - y > 1 . . . . . . . . the form is ... x is greater than some value

_____

If you like, you can restructure this inequality to the form ...

y < 0.1x -1 . . . . . . slope-intercept form

so you can better see that the y-intercept is -1 (true for all of the choices) and the slope is 0.1. You can also see in this form that the shading will be for y-values below those on the boundary line.

_____

Comment on shading direction

I find it easiest to find a variable in the equation that has a positive coefficient and look to see what the comparison operator is in relation to that:

( )x + ... > ... will be shaded to the right of the line

( )x + ... < ... will be shaded to the left of the line

( )y + ... > ... will be shaded above the line

( )y + ... < ... will be shaded below the line

When the inequality here is written in the slope-intercept form shown above, you can see that the shading will be below (y < ...) and to the right (x > ...) of the line. Since the line has positive slope, these descriptions of the shading both describe the same thing.

User Isaac Truett
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