You put in the answers you got for your variables into one of the equations. If it gives you the correct answer then you solved it, if it's different then either it doesn't work or one of the steps wasn't completed correctly or at all.
substitution
i don't know the answer to this questions
Here's a mark you use in your math every day, and right now, you have to stopfor a second and understand and accept what it really means:=See that ? That's the "equals" sign. When you write (one quantity) = (another quantity), that means that honestly and truly, those two quantities are not only 'equivalent', butliterally equal in every way. Either one can do anything and everything that the otherone can do, and wherever you see one of them, you can stick the other one in its place,because they're equal in every way.That's why substitution is a legitimate operation. If a statement is true before substitution,it's still true after substitution.
yes, because obviously you know how
No.It dilutes you and you literally fail from DILUTION they see your specific gravity of the urine (the density) , the levels are off and they know substitution is the only way you need to "fake it."
because there is. that is one of the questions that people always ask there selves. they never know how an when they got there
Because it gives you instant access to millions of questions and answers from still millions of people around the world. It allows you to post questions and answers and get immediate notification of a response or change. It gives you a face, a personafor others to put to the questions and answers you contribute. It allows you to make positive changes to the site that unregistered users do not have access to. And, it gives you a venue, a medium for speaking your mind and sharing what you know.
No. B may not know the answer to a question on the test, but A might not know the answer to another question not on the test. basically, it depends on what questions the test asks.
when i get the ans i'll let u know all
It is not possible to know exactly what the question is because the browser used by this site is almost totally useless for mathematical questions: it rejects most symbols. If the equations are 2y + 2x = 20 and y - 2x = 4,then the solution is (2, 8).
People answer all of the 'stupid' questions because they know the answer to those 'stupid' questions, whereas people do not usually know the correct answer to a serious question. Therefore, they only answer questions that they know the answer to, and ironically not answering the serious questions because they don't know the answer to it.