ANSWERS: 2
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a = -1 b = -4 c = 2.5
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Subbing in the values for x, y & z in Equations 1-3 E1: a-b-6=-3 a–b=3 a=3+b E2: -2+b+2c=-1 b+2c=1 2c=1-b E3: a+3–2c=-3 a–2c=-6 Subbing in the values for "a" (from E1) and "2c" (from E2) into Equation 3 gives (3 + b) – (1-b) = -6 So working that out.... 2 + 2b = -6 2b = -8 b = -4 Subbing the now known value of b into the two equations gives us the final results: E1 a = 3+(-4) = -1 E2 2c = 1 - (-4) = 5 therefore c = 2.5
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