Answer:
x = -3
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)