-9.3x+8.6y=45.1 7.1x+1.7y=-17.9 What is x and y?
1 answer:
Answer:
(x, y) = (-3, 2)
Step-by-step explanation:
For equations that involve tedious math, I like to let a graphing calculator do it. The solution is ...
(x, y) = (-3, 2)
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Fully equivalent to solution by elimination is the use of Cramer's rule. It tells you ...
Δ = (-9.3)(1.7) -(7.1)(8.6) = -76.87
x = ((45.1)(1.7) -(-17.9)(8.6)) / Δ = 230.61/-76.87 = -3
y = ((-9.3)(-17.9) -(7.1)(45.1)) / Δ = -153.74/-76.87 = 2
The solution is (x, y) = (-3, 2).
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