A shortcut for SAT math questions about perpendicular lines: plot the given line on a graphing calculator, then adjust a slope slider until your line forms a right angle with it. Test each multiple-choice option to confirm which one works.
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Here's how you can solve tons of SAT math problems without doing any math. Whenever a question asks for you to solve for the slope of a perpendicular line, open up the calculator and type in the equation. Then you have to enter in the equation for a straight line, which is gonna be y mx b. You're gonna fill b in for -4, add slider for m, that a perpendicular line forms a right angle. All you have to do is adjust m until it forms a right angle here. Once you're— you see an L shape or a right angle, All you have to do is enter in the answer choices. Start off with the first one, y -3/2, and add an x to it to find out what the line looks like. Then you want to adjust the line by doing minus and get a certain number here. So in this case, we'll do 4, and that right there is almost perfect. So we realize that this choice is going to be the answer. Go to the website StudyShare.app for thousands of other questions like this.