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Sagot :
Answer:
x = -2
y = 10
Step-by-step explanation:
(0.3 + 0.7) x + (0.4 - 0.8) y = 0.8 - 6.8
x - 0.4 y = -6 → x = 0.4 y - 6
0.3 ( 0.4 y - 6) + 0.4 y = 0.8 → 0.12y +0.4y - 1.8 = 0.8
→ 0.52 y = 2.6 → y = 2.6/0.52 = 10
x - 0.4(10) = -6 → x = -2
Step-by-step explanation:
0.3x + 0.4y = 0.8 /×2
0.7x - 0.8y = -6.8
1. 0.6x + 0.8y = 1.6
2. 0.7x - 0.8y = -6.8
1+2 : 1.3x + 0y = -5.2
1.3x = -5.2
x = -5.2÷1.3
x = -4
x -> 1 : 0.6 × -4 + 0.8y = 1.6
-2.4 + 0.8y = 1.6
0.8y = 4
y = 4÷0.8
y = 5
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