What's substitution for y=4x-1; y=2x-5

y = 4x - 1; y = 2x - 5

Step: Solve y = 4x - 1 for y:

Step: Substitute 4x - 1 for y in y = 2x - 5:

y = 2x - 5

4x - 1 = 2x - 5

4x - 1 + - 2x = 2x - 5 + - 2x (Add - 2x to both sides)

2x - 1 = - 5

2x - 1 + 1 = - 5 + 1 (Add 1 to both sides)

2x = - 4

2x / 2 = - 4 / 2 (Divide both sides by 2)

x = - 2

Step: Substitute - 2 for x in y = 4x - 1:

y = 4x - 1

y = (4) (-2) - 1

y = - 9 (Simplify both sides of the equation)

Answer: y = - 9 and x = - 2