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Mathematics 21 Online
OpenStudy (anonymous):

Having a time figuring this out. If someone could help, please :) select 2 integers between -2 and +2 which will become solutions to a system of two equations My integers could be -3 and 9

OpenStudy (anonymous):

find two numbers b/w -2 and +2 i would suggest using -1 and +1 not sure why you pickeed -3 and 9 those are not within given range

OpenStudy (anonymous):

Okay I can use the -1 and +1 no problem, not sure what you mean by range though? Numbers and I just don't click well.

OpenStudy (anonymous):

your question said "select 2 integers b/w -2 and 2

OpenStudy (anonymous):

|dw:1331246838038:dw|

OpenStudy (anonymous):

Okay so this is the range your speaking of. On a line, okay. I have a set of 5 steps to use for this, but do not understand them at all.

OpenStudy (anonymous):

This is new to me doing the math with live help so what should I do next?

OpenStudy (anonymous):

ppost the next step they asked

OpenStudy (anonymous):

Write two equations that have your two integers as solutions. Show how you built the equations using your integers. . There are infinite possibilities. 3. Solve your system of equations by the addition/subtraction method

OpenStudy (anonymous):

they are wanting you to take your solutions 1 and -1 and build a equation so think of this as x =1 and x = -1 set both of thosee to 0

OpenStudy (anonymous):

okay so do you mean x= 1 and y= -1

OpenStudy (anonymous):

okay - they did say solution to system of equations ok go with x = 1 and y = -1

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

This is the directions from my book....Procedure for Solving a System of Equations Using the Addition/Subtraction (Elimination) Method Step 1 If necessary, write both equations in the form ax + by = c. Step 2 Multiply one or both equations by numbers so that the absolute values of either the coefficients of the x terms or the y terms are alike. Step 3 Eliminate one of the variables by adding the equations if the signs of the coefficients of the variable are different. Subtract the equations if the signs of the coefficients of the variable are the same. Step 4 Solve the resultant equation for the remaining variable. Step 5 Select one equation from the original two equations, substitute the value of the variable found in step 4, and solve for the other variable.

OpenStudy (precal):

yes are you trying to solve a system, if so poste the systems. This is just the steps for Elimination method

OpenStudy (precal):

We can help you

OpenStudy (anonymous):

you can help me, oh thank you. I was going to use the integers -3 and 9

OpenStudy (precal):

yes but do you have a system you are working with example 2x-3y=10 3x-y=5 something that looks like the above but different numbers of course

OpenStudy (anonymous):

yes here are the first set of instructions- Select any two integers between -12 and +12 which will become solutions to a system of two equations. Write two equations that have your two integers as solutions. Show how you built the equations using your integers

OpenStudy (anonymous):

So using the integers -3 and 9 to become my solutions how do I get this going

OpenStudy (precal):

I would think it is more of a guess and check method. You really can't go wrong doing this problem. They are asking you to think backwards. Some people think this is the way to teach math. They feel if you talk about it, it helps with the process Lets make x=-3 and y =9 We need 2 lines that intersect at the point

OpenStudy (anonymous):

okay, yes. like on a graph?

OpenStudy (precal):

|dw:1331250329573:dw|

OpenStudy (precal):

|dw:1331250352525:dw|

OpenStudy (precal):

Ok what kind of line did I draw? Don't worry if you are wrong, because answers vary. What do you know about that line? what kind of slope is it? What kind of y intercept is it?

OpenStudy (anonymous):

I really am not sure, I do know you started at the top of the page and desended to the lower right

OpenStudy (precal):

what kind of slope does that? positive, negative, zero or underfined

OpenStudy (anonymous):

is it negative?

OpenStudy (precal):

yes because it is going down, ok what kind of y-intercept is it? positive, negative, or zero

OpenStudy (anonymous):

I dont know is it zero

OpenStudy (precal):

sorry, I am multi tasking but it if were zero it would cross (0,0)

OpenStudy (precal):

where is it on the y - axis? remember positive, negative or zero

OpenStudy (anonymous):

it's positive I think because it is above the x

OpenStudy (precal):

yes, you are right - pick a number but don't make it too big

OpenStudy (anonymous):

5

OpenStudy (precal):

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