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messersmith_power_intermediate_algebra_1e_ch4_7_10

c) We must determine how many days it would take for the hair to grow to a length of 274 mm. The length, 274 mm, is the y-value. We must fi nd the value of x that corresponds to y 274 since x represents the number of days. The equation relating x and y is y 0.30x 250. We will substitute 274 for y and solve for x. y 0.30x 250 274 0.30x 250 24 0.30x 80 x It will take 80 days for her hair to grow to a length of 274 mm. This corresponds to the ordered pair (80, 274) and is consistent with what is illustrated by the graph. ANSWERS TO YOU TRY EXERCISES 1) a) b) c) d) e) f) 2) a) yes b) no c) yes 3) a) b) x y (1, ) 72 (2, 0) (3, 1) 5 5 5 (0, 5) (2, 4) (4, 3) 5 x y 5 2 5 5 5 x 2y y 4x 8 x y 3 (2, 0) 2 5 10 (1, 4) (0, 8) y 4) 5) x 6 (1, 3) (2, 0) (0, 6) 6 6 6 y 3x 6 x y 5 (4, 1) x 4 (4, 0) 5 5 (4, 1) 5 y 6) 7) a3, 1 2 b y 1 x 5 (2, 1) (0, 1) (2, 1) 5 5 5 www.mhhe.com/messersmith SECTION 4.1 Introduction to Linear Equations in Two Variables 149


messersmith_power_intermediate_algebra_1e_ch4_7_10
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