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Solve the following simultaneous equations graphically: y = 1/2x - 1, y = -2x - 1

Mathematics

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Answer

x=0,y=−1x = 0, y = -1

Step-by-step solution

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Huu hapa ni ufumbuzi wa swali la 37:

Ili kutatua milinganyo shirikishi kwa kutumia grafu, tunahitaji kuchora kila mstari kwenye grafu na kisha kupata sehemu wanapokutana.

  1. Pata pointi za kuchora mstari wa kwanza, y=12x−1y = \frac{1}{2}x - 1.

    Chagua thamani za xx na kokotoa thamani za yy:

    • Ikiwa x=0x = 0: y=12(0)−1=−1y = \frac{1}{2}(0) - 1 = -1. Pointi ni (0,−1)(0, -1).
    • Ikiwa x=2x = 2: y=12(2)−1=1−1=0y = \frac{1}{2}(2) - 1 = 1 - 1 = 0. Pointi ni (2,0)(2, 0).
    • Ikiwa x=−2x = -2: y=12(−2)−1=−1−1=−2y = \frac{1}{2}(-2) - 1 = -1 - 1 = -2. Pointi ni (−2,−2)(-2, -2).
  2. Pata pointi za kuchora mstari wa pili, y=−2x−1y = -2x - 1.

    Chagua thamani za xx na kokotoa thamani za yy:

    • Ikiwa x=0x = 0: y=−2(0)−1=−1y = -2(0) - 1 = -1. Pointi ni (0,−1)(0, -1).
    • Ikiwa x=1x = 1: y=−2(1)−1=−2−1=−3y = -2(1) - 1 = -2 - 1 = -3. Pointi ni (1,−3)(1, -3).
    • Ikiwa x=−1x = -1: y=−2(−1)−1=2−1=1y = -2(-1) - 1 = 2 - 1 = 1. Pointi ni (−1,1)(-1, 1).
  3. Chora pointi hizi kwenye grafu na unganisha pointi za kila mlinganyo ili kuunda mistari miwili.

    Mstari wa kwanza utapita kwenye (0,−1)(0, -1), (2,0)(2, 0), na (−2,−2)(-2, -2).
    Mstari wa pili utapita kwenye (0,−1)(0, -1), (1,−3)(1, -3), na (−1,1)(-1, 1).

  4. Tambua sehemu ambapo mistari miwili inakutana.

    Mistari yote miwili inakutana kwenye pointi (0,−1)(0, -1).

    Hivyo, suluhisho la milinganyo shirikishi ni:

    x=0x = 0 y=−1y = -1

    Suluhisho ni x=0,y=−1x = 0, y = -1.

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