# Eaton's Elementary Algebra, Designed for the Use of High Schools and Academies

Thompson, Brown, and Company, 1875

### Contents

 DEFINITIONS AND NOTATION 7 DEFINITIONS AND NOTATION Continued from Section I 14 SUBTRACTION 25 SECTION VI 31 SECTION VII 37 SECTION VIII 43 SECTION X 54 SECTION XII 63
 SECTION XIII 112 SECTION XV 118 EQUATIONS OF THE FIRST DEGREE CONTAINING BUT ONE UNKNOWN QUANTITY 121 SECTION XVI 125 SECTION XVII 154 SECTION XVIII 170 SECTION XIX 178 SECTION XXI 207

 To subtract Fractions 69 75 90 76 103 Elimination by Substitution 105
 SECTION XXII 215 SECTION XXIII 225 SECTION XXIV 236 XXV 253

### Popular passages

Page 207 - An INVERSE, or RECIPROCAL RATIO, of any two quantities is the ratio of their reciprocals. Thus, the direct ratio of a to b is a : b...
Page 10 - In reducing the equation so as to find the value of the unknown quantities. EXAMPLES FOR PRACTICE. 1. The sum of the ages of a father and his son is 60 years, and the age of the father is double that of the son ; what is the age of each...
Page 44 - ... the square of the second. In the second case, we have (a — &)2 = a2 — 2 ab + b2. (2) That is, the square of the difference of two quantities is equal to the square of the first, minus twice the product of the two, plus the square of the second.
Page 83 - ... quantity. 4. If one member is divided by any quantity, the other member must be divided by an equal quantity. 5. If one member is involved or evolved, the other must be involved or evolved to the same degree. TRANSPOSITION. 100. TRANSPOSITION is the changing of terms from one member of an equation to the other, without destroying the equality.
Page 155 - Resolve the quantity under the radical sign into two factors, one of which is the greatest perfect power of the same degree as the radical.
Page 45 - ... the product of the two, plus the square of the second. In the third case, we have (a + b) (a — b) = a2 — b2. (3) That is, the product of the sum and difference of two quantities is equal to the difference of their squares.
Page 207 - PROPORTION when the ratio of the first to the second is equal to the ratio of the second to the third.
Page 87 - Four quantities are proportional when the ratio of the first to the second is equal to the ratio of the third to the fourth.
Page 43 - I. The square of the sum of two quantities is equal to the square of the first, plus twice the product of the first by the second, plus the square of the second.
Page 251 - How far from Boston did they meet ? Ans. 42 miles. 163. The product of two numbers is 90 ; and the difference of their cubes is to the cube of their difference as 13 : 3. What are the numbers? 164. A and B start together from the same place and travel in the same direction. A travels the first day 25 kilometers, the second 22, and so on, travelling each day 3 kilometers less than on the preceding day, while B travels 14£ kilometers each day. In what time will the two be together again ? Ans. 8 days.