He quickly graphed the lines to show that they intersect at (0, 0) which is the same solution we found be solving. Sal decided to use the fact that this is a system of linear equations, which means it represents two lines. So there is one solution and it also explains why y can equal 9y. Plug that into your original equation to find out that when y = 0, x = 0 Instead you need to use algebra to isolate the y by subtracting y from both sides: You might be tempted to say IMPOSSIBLE! y cannot equal 9y
If you substitute the value for x into the equation for y you get y = 3 (3y) If you try substitution to solve this system, you get some strange equations.
If you are able to get any solution, you CAN say that the "zero solutions option" is not correctĪnother reason it would be tricky to solve is that this problem is tricky to solve. The answer is whether there are two solutions, only one solution, no solutions or infinite solutions. The answer is not the number that you would get when you solved the equations. Please sign in to leave a comment.Yes, but you have to be careful. So i see what he means i LOVE KA but i get side-tracked way too often :D It definitely needs to be clear though what we need to do first because maths is a very step-by-step process and we need a smooth process to keep going on a mostly smooth path, it's mainly what's made me see something as very hard to understand and i end up spending hours sifting through the info trying to get things straight for myself lol it's painful to say the least but i don't want it to keep occuring, it's already a lot of work going over it all then the practise i put in. I've gotten caught out like this a couple times doing the earlier grades as well too hard too quickly (or so it seems) but i know it's not going to change quickly either so if i get this in future i know i need to get it straight which concepts i should learn first and if it makes me go too far then i then eventually backtrack to where i need to be and what i need to work on first.
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