Substitution

Solve equations by substitution:

x+y= 11
y=5x-25

Correct answer:

x =  6
y =  5

Step-by-step explanation:


x+y= 11
y=5x-25

x+y= 11
y=5·x-25

x+y = 11
5x-y = 25

Pivot: Row 1 ↔ Row 2
5x-y = 25
x+y = 11

Row 2 - 1/5 · Row 1 → Row 2
5x-y = 25
1.2y = 6


y = 6/1.2 = 5
x = 25+y/5 = 25+5/5 = 6

x = 6
y = 5

Our linear equations calculator calculates it.



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