Explanation for Question 25 From the Math (Calc) Section on the Official Sat Practice Test 10
Now for question number 25 or given the systems of equations. 2 And the first thing you might see is decimals. 3 And that might be freaking you out a little bit, but I want you 4 to try to be calm about the decimals. 5 Notice that the decimals are really similar to normal numbers, 6 right? The 2.4 is kind of like you're working with the 24, 7 just with a.in the middle. The 1.6 is just like you're working with the 8 16, but with the.in the middle. So don't worry about the decimals. 9 What we really need to do here is thinking about how we can solve 10 for the X coordinate. And one thing I do want to point out to 11 you about the decimals is that you don't need to be worried about them, 12 but you also want to be clever with them, right? 13 We can think about how there's two ways to solve this equation. 14 And for substitution, we like to say, 15 you know, Y is equal to two X plus three. 16 For example, we like to get all of our V one particular variable assault 17 for you can ask yourself, is that probably the easiest way to go about 18 doing something with decimals, right? 19 And it, and it might not be that that might not be the case. 20 And so I'm thinking that a really good way to go about this question 21 is actually going to be elimination, right? 22 And you can imagine that if we're solving for X, 23 you're going to want to eliminate the Y variable. 24 That's the one you want to eliminate, right? 25 You essentially want to eliminate the opposite of what you're solving f...