# Webinar demo video on SAT Math preparation [embed]https://youtu.be/SJid0qwL8zA[/embed]

Webinar Demo Video on SAT Math

Hi, Everyone Welcome to Fabmarks SAT Math Prep demo for the upcoming webinar. Now we're going to look at “When to Eliminate?” and also “How to Eliminate”? Let’s move on. Let's look at this question  ?x+?9=?64?x+?9=?64, what is the value of xx? Look at the answer choices these are all numbers
• 5
• 55
• 25
• ?5?5
One way to eliminate the wrong answer choices and pick the right one is to assume one of the answers to be right and check whether it actually is right or not. Let’s assume one of these answer choices to be the value of x now, because that's what is actually asked. Which one would be an easy assumption to be made here is looking at root xx we would like to have a number which is a perfect square. Let's verify 25 now.  ?25+?9?25+?9 =is that equivalent to ?64?64  . >>5+3= 8 Yes, in fact, it is right. So the assumption that we have made that is c= 25 turned out to be right and that is your right answer. If it did work if this equation did hold true you will try the same with any other answer choices left, but for now the only answer choice amongst the four which was a perfect square, Actually turned out to be the right answer also. When do you solve the questions in this process when you have numbers in the answer choices, check the answers, check which of them could fit into the Equation, Which ever fits in the equation and makes it to a valid would be the right answer. Let's look at another video to eliminate answer choices, another question here. Which of the following is a graph of the equation y=2x?5y=2x?5? It's a linear equation, so the graph of that on the coordinate plane would look a line. Look at the answer choices ABCD. All of them show four lines. There's a slight difference between all of those lines. Now y=2x?5y=2x?5 is a line which is of the format y=mx+cy=mx+c. Whose slope is equivalent to m. So the slope of this line is 2 which is greater than zero. A line which has a positive slope moves higher as you move from the left to the right. Now using this concept we can eliminate one of the answer choice B, which is a line which is falling down as you move from the left of the right. All the other answer choices A, C, D have lines which moves higher as you move from the left to the right.  Now let's use another concept in it one of those are two of those remaining answer choices. y=2x?5y=2x?5. Let's check were does it intersect the y-axis? How do I get the y-intercept of the line is by putting x=0x=0 in it Let's place x=0x=0 in it.
• y=2(0)?5y=2(0)?5
So its -5, So the y intercept = (0, -5). This is a negative y intercept the only line which has a negative y intercept is the answer choice is D. This (Option C) has a positive y, so this is not a right answer. This (Option A) also has a positive intercept this is also not all right answer and there are two concepts that we have used to eliminate made the three wrong answer choices:
1. The Y-intercept concept and
2. The slope positive/ negative concept.

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