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# College Algebra MATH 143

BSU

GPA 3.72

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This 2 page Class Notes was uploaded by Breanne Schaden PhD on Saturday October 3, 2015. The Class Notes belongs to MATH 143 at Boise State University taught by Barbara Kenny in Fall. Since its upload, it has received 14 views. For similar materials see /class/217995/math-143-boise-state-university in Mathematics (M) at Boise State University.

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Date Created: 10/03/15

Math 143147 Section 110 and Section 111 bkenny 3112003 Section 110 Formulas for lines Given zhyl and x27y27 slope is m 2 1 slope intercept y ms b m slope7 b y intercept Given a point zhyl and the slope m7 point slope forrn y 7 yl mx 7 x1 parallel lines have the same slope perpendicular lines Let m1 be the slope of line L1 and m2 be the slope of line L27 then if L1 is perpendicular to L27 the slopes are negative reciprocals7 or m2 if or 77117712 71 7711 vertical line unde ned slope equation x a horizontal line zero slope equation y b linear equation general form Ax By C 0 where A7B70 are integers and A is positive Section 111 Variation and Proportion For some constant of proportionality k7 y varies directly as x y varies inversely as x y is directly proportional to z y is inversely proportional to z yk 21 z varies jointly as x and y z is jointly proportional to z and y z my 1 Find the equation of the perpendicular bisector of the line segment joining 723 and 4 7 2 Find the equation of the line shown 81 Express the t t t as a formula For 3 5 and 6 nd the constant of proportionality and use it to rewrite the formula appropriately 3 Neglecting air resistance the distance d that an object falls varies directly as the square of the time t it has been falling If an object falls 64 feet in 2 seconds determine the distance it will fall in 6 seconds 4 R is jointly proportional to l and inversely proportional to P and T 5 A company has found that the daily demand D for its product is inversely proportional to the price P When the price is 5 the demand is 800 units Estimate the demand if the price is increased to 6 6 The period of a pendulum the time elapsed during one complete swing of the pendulum varies directly with the square root of the length of the pendulum If we double the period how does that change the length

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