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1. Which ordered pair is the best estimate of the solution of the system?


(Points : 1)
A. (2.1, –0.8)
B. (2.1, –0.2)
C. (2.7, –0.8)
D. (2.7, –0.2)

1 Which Ordered Pair Is The Best Estimate Of The Solution Of The System Points 1 A 21 08 B 21 02 C 27 08 D 27 02 class=

Sagot :

1x + 5y = -2  ⇒ 2x + 10y = -4
2x -  7y = 10 ⇒ 2x -    7y = 10
                                  17y = -14
                                   17      17
                                      y = -¹⁴/₁₇
                      x + 5(-¹⁴/₁₇) = -2
                          x - 4¹²/₁₇ = -2
                           +  4¹²/₁₇  + 4¹²/₁₇
                                     x = 2¹²/₁₇
                                (x, y) = (2¹²/₁₇, -¹⁴/₁₇)