College Algebra

Cover College Algebra
College Algebra
James Harrington Boyd
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274 COLLEGE ALGEBRA L??258, 259 If / = 4, etc., or — 1, — 2, etc., the values of x or of »/ will be negative.
268. To solve the equation ax-\-hy-\- cz = d in positive integers one may proceed thus: write it in the form ax+ hy ^=id — rz, then give to z the values 1, 2, 3, . . in succession and determine in each case the values of x and y by the preceding articles.
259. General solution of two simultaneous equations in three unknown quantities. Solve in integral values the equations, (1) ax-\-hy-
...^cz^:zd (2) aU + h'y + c'z = d\ Eliminate, «, for example, we obtain an equation connecting the other two variables, Ax-\- By = (\ suppose. Now if ^l and B have only such common factors as are contained in C, then proceeding as in §2256, 257 we may find (3) x= 1+ nt, y =m-^ At .
Substitute now these values in either equation (1) or (2) and obtain an equation in t and z, which can be written AU -\- h'z = (?. If A' and B* do not contain any common factors except such as are also common to C", we may write (4) tz=VJ^ B't', z-w!


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