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Do you understand how to substitute?
Okay, firstly, you want one equation as either Y or X by itself.
If you do that part, i'll then explain the next step.
okay wat the next step
write the equation you've got for your isolated variable in here.
|dw:1360887641308:dw| is that right how i solve for y
- 7y + - 7y is not zero and 4x + x is 5x
You need a variable to cross out when you add down. Try multiplying one of the equations by a certain number so that one variable crosses out when you add down.
Okay, here is an example problem I'll draw it.
Now see how none of the variables cross off? So I'm going to try multiplying the first equation by - 1 and see what happens.
Now see if you add straight down a variable crosses off when you add down. - y and y can also be put as - 1y and 1y. Look at the numbers - 1 + 1 = 0, so that crosses off.
Now all we have to do is divide both sides by - 1, so undo the multiplication
So we have our x value, now what about y? What we do is we plug in the x value (substitute 8 for x) in one of the original equations. In this case the bottom equation is easier to do this.
could u help me with my problem cuz i dont understand ur problem
See, in my problem how I multiplied one equation by - 1? Try doing that with either one of your equations and then add down.
Remember, a negative * a negative is a positive.
Did you get it? Give it a try. I'll check your answer and if you make a mistake I'll work through it for you.