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If you don't get a problem right on either our tests or a real SAT test, first try to solve the problem yourself. If you still can't get it right, ask a friend or a teacher. If your fundamentals are weak and you need extra help check out our recommended resources.

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http://www.algebrahelp.com/calculators/expression/oops/ then look for what ever calculator you need.

Math calculators & answers: elementary math, algebra, calculus, geometry, number theory, discrete & applied math, logic, functions, plotting & graphics, advanced.

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with 2 variables you have to have 2 separate equations that each tell you what the problem equals. for example: 2x + 3y = 19 and 10x - 2y = 44 if you only have 1 of the problems, you cant solve absolutely because x and y could be any number of things, but with two points of reference, you can solve as so: for one of the problems, isolate a variable: 2x + 3y = 19 2x = 19 - 3y x = (19 - 3y)/2 now you know what x equals, so you can go back to the second equation and replace all the x variables with (19 - 3y)/2. in this way, the problem will only have y s and you can solve for y. once you know the answer to y, you go back to either equation, fill in the answer for y and solve for x. if you have 3 varibales, you have to have 3 equations and it is just that much more difficult, but still doable.

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How do you go about teaching problem solving skills? How do you teach pupils the thinking skills necessary to solve mathematical problems in contexts that are unfamiliar to them?

These are difficult questions. I’ll declare upfront that I don’t have the answers to them fully. Nonetheless I have been researching and formulating possible approaches. This post shares with you where I am at with my current thinking and I hope will spark an interesting debate in the comments section where our readers can extend the ideas further.

Instead of standing at the front of the room and teaching my kids how to do math---step by boring step—I pose a problem.  The kids work together and use their own strategies to solve that problem. It allows students to make sense of math and to build upon what they already know.

(1)  Mathematical process standards. The student uses mathematical processes to acquire and demonstrate mathematical understanding. The student is expected to: