What is the value of x in the system of equations shown below?
5x + 4y = 1
y = 1 - x

x = -3

Step-by-step explanation:

Plug in                

5x + 4(1 - x) = 1    

(y gets replaced by 1 - x)

Multiply                

5x + 4 - 4x = 1

(multiply 4 by whats in the parenthesis)

Combine Constants          

5x - 4x = -3

(constant = numbers without a variable)

(separate constants from variables = numbers with letters)

Combine Variables        

1x = -3

(then you got your answer and you can take the "1" off the x)

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step-by-step explanation: