Linsys2

Solve two equations with two unknowns:

400x+120y=147.2
350x+200y=144

Correct answer:

x =  0.32
y =  0.16

Step-by-step explanation:


400x+120y=147.2
350x+200y=144

400·x+120·y=147.2
350·x+200·y=144

400x+120y = 147.2
350x+200y = 144

Row 2 - 350/400 · Row 1 → Row 2
400x+120y = 147.2
95y = 15.2


y = 15.2/95 = 0.16
x = 147.2-120y/400 = 147.2-120 · 0.16/400 = 0.32

x = 8/25 = 0.32
y = 4/25 = 0.16

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