There are several ways to solve system of equations and inequalities, including graphing and using equivalent forms of equations and inequalities within the system. SOLVE USING 2 DIFFERENT METHODS

a. 3x-9y=3 b.7x-3y=20 C. y=1/2x-6
6x-3y=-24 5x+3y=16 2x+6y=19

Question

There are several ways to solve system of equations and inequalities, including graphing and using equivalent forms of equations and inequalities within the system. SOLVE USING 2 DIFFERENT METHODS 

a. 3x-9y=3        b.7x-3y=20     C. y=1/2x-6
    6x-3y=-24       5x+3y=16        2x+6y=19

tkhunny · Answer

Well, you should get to it.  Which two methods will you select for each?

anonymous · Answer

Substitution seems the easiest

anonymous · Answer

And elimination using addition, subtraction and multiplication

tkhunny · Answer

Let's see it.  No graphing?

anonymous · Answer

no graphing. I find it too complicated.

tkhunny · Answer

Okay, for elimination, which equation will you be multiplying by what?

I recommend C1 being multiplied by 2 before you do anything else.

anonymous · Answer

I really need help, because I don't understand how to do this AT ALL! Could you walk me through it step by step? please? I haven't learned this yet. These are my very first questions over this subject.

anonymous · Answer

Keep in mind that I am only in 7th grade.

tkhunny · Answer

What do you get when multiplying C1 by 2?

Doesn't matter what grade you are in.

y=1/2x-6

Multiply everything by 2.

anonymous · Answer

3 and -12

anonymous · Answer

y=3x-12  right??

tkhunny · Answer

2*1 = 2
2* 1/2 = 1
2 * -6 = -12

2y = x - 12

This is also the only one not in standard form.  Can you get it to standard form, matching all the others?

anonymous · Answer

What is standard form?

tkhunny · Answer

Look at the other five.  You have to look at the clues around you.

Which variable appears first?
Where is the '=' in relation the the variables and constant terms?

anonymous · Answer

Can you solve one for me? But be sure to show me everything you did to get the answer. Then I can try to do the rest with your help.

tkhunny · Answer

No.  If you do not have sufficient background even to make one equation look like the other five, then no demonstration of a solution will be helpful to you.  You must show some ability to solve the problems.  So far, you have not done so.  Why were you given these problems?  Is this a placement exam?

anonymous · Answer

I was given these problems as in introduction to my system of equations and inequalities unit. If you show me what you did for just ONE... I can do the rest based off of what I saw you do. You would really help me a lot, and help me learn this faster.

tkhunny · Answer

You need basic algebra skills that you don't seem to have.