System equation solving

Solve the system:

15x + 30y = -20
0.3x-0.2y = 0.4

Final Answer:

x =  0.6667
y =  -1

Step-by-step explanation:


15x+30y=-20
0.3x-0.2y=0.4

15·x+30·y=-20
0.3·x-0.2·y=0.4

15x+30y = -20
0.3x-0.2y = 0.4

Row 2 - 0.3/15 · Row 1 → Row 2
15x+30y = -20
-0.8y = 0.8


y = 0.8/-0.8 = -1
x = -20-30y/15 = -20-30 · (-1)/15 = 0.66666667

x = 2/3 ≈ 0.666667
y = -1

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