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

Step-by-step explanation:

y = 1 - xso sub 1 - x in for y back into the other equation and solve for x

5x + 4y = 1

5x + 4(1 - x) = 1

5x + 4 - 4x = 1

x + 4 = 1

x = 1 - 4

x = -3

y = 1 - x

y = 1 - (-3)

y = 1 + 3

y = 4

solution : x = -3 and y = 4 or (-3,4)