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Algebra 20 Online
OpenStudy (anonymous):

The graph below represents which system of inequalities?

OpenStudy (anonymous):

OpenStudy (anonymous):

y > 2x - 3 y > -x - 3 y < 2x - 2 y < -x + 3 y <= 2x - 2 y > -x + 3 None of the above

OpenStudy (anonymous):

@mathstudent55 Can you help me out <3!

OpenStudy (mathstudent55):

Look at the solid line in the graph. A solid line means >= or <=.

OpenStudy (anonymous):

Yes?

OpenStudy (mathstudent55):

I have a question for you. Did you copy your choices correctly?

OpenStudy (anonymous):

Yes i did

OpenStudy (mathstudent55):

In your 3 choices, only one choice has one inequality with >= or <= in one of the inequalities. All other inequalities only have > or <.

OpenStudy (anonymous):

OpenStudy (mathstudent55):

If you copied the choices correctly, then A and B cannot be the answer because they both have only > or <. The solid line means <= or>=. So eliminate choices A and B.

OpenStudy (anonymous):

So its either C or D but how do i know??

OpenStudy (mathstudent55):

Oh, I see the choices are below the graph. You are correct. Once again, A nad B are out. Let's look at C.

OpenStudy (mathstudent55):

Look at the solid line in the graph. It has a y-intercept of what? Where does the solid line cross the y-axis?

OpenStudy (anonymous):

It crosses at 1

OpenStudy (mathstudent55):

Thta is the x-axis. I asked where it crosses the y-axis.

OpenStudy (anonymous):

-_-sorry -2

OpenStudy (mathstudent55):

OK. That suggests a line with equation y = mx - 2 Now let's look at the slope of the solid line.

OpenStudy (anonymous):

The slope is 1 :D

OpenStudy (mathstudent55):

Start at the point where the solid line crosses the y-axis. Go up 2 units and to the right 1 unit. That's a point on the line, right?

OpenStudy (anonymous):

Nope.

OpenStudy (mathstudent55):

Yes it is. That's the point (1, 0) which is the x-intercept and the line goes right through it.

OpenStudy (anonymous):

I am really lost

OpenStudy (mathstudent55):

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