To obtain the exact solution to the system of equations, fi rst return to the home screen by pressing 2nd MODE. To display the x-coordinate of the solution, press X,T,,n MATH ENTER ENTER, and to display the y-coordinate of the solution, press ALPHA 1 MATH ENTER ENTER. The solution to the system is a8 3 , 7 3 b. Use a graphing calculator to solve each system. 1) y x 4 2) y 3x 7 3) y 4x 2 y x 2 y x 5 y x 5 4) 5x y 1 5) 5x 2y 7 6) 3x 2y 2 4x y 2 2x 4y 3 x 3y 5 ANSWERS TO YOU TRY EXERCISES 1) a) no b) yes 2) (2, 2) 3) a) 5 y 3x 2y 2 5 5 y x 3 5 (2, 2) x 12 y 5 x y 1 5 5 x y 4 5 b) infi nite number of solutions of the form {(x, y)02x 6y 9} x y 5 5 5 5 2x 6y 9 4x 12y 18 4) a) no solution b) infi nite number of solutions c) one solution ANSWERS TO TECHNOLOGY EXERCISES 1) (1, 3) 2) (3, 2) 3) a 7 5 , 18 5 b 4) a1 9 , 14 9 b 5) a11 8 , 1 16 b 6) a 16 7 , 17 7 b www.mhhe.com/messersmith SECTION 4.1 Solving Systems by Graphing 251
messersmith_power_introductory_algebra_1e_ch4_7_10
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