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Solve this system of equations: 2x+y=11
                                                    y=x-1

Please explain how you got it and try to explain your steps!

Respuesta :

Use the substitution method to solve. 

2x+y=11
y=x-1

We have the value for y, so put it in the first equation.

2x + x - 1 = 11
2x + x = 3x
3x - 1 = 11
      + 1    +1

3x = 12
x = 4

Now solve for y 

y=x-1
y = 4 - 1
y = 3

Answer: y = 3 and x = 4


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