Graphical 4680

Solve the system by the graphical method:
x + y = 8
2x-y = 1

Correct answer:

x =  3
y =  5

Step-by-step explanation:


x+y=8
2x-y=1

x+y=8
2·x-y=1

x+y = 8
2x-y = 1

Pivot: Row 1 ↔ Row 2
2x-y = 1
x+y = 8

Row 2 - 1/2 · Row 1 → Row 2
2x-y = 1
1.5y = 7.5


y = 7.5/1.5 = 5
x = 1+y/2 = 1+5/2 = 3

x = 3
y = 5

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