The ordered pair (, 4) is a solution to the equation y=5x-1.

So, if you're only given the y coordinate in your problem, you would plug that back into your equation

y=5x-1 turns into

4=5x-1 and you can solve by

5=5x

1=x

so the ordered pair turns out to be

(1,4)

y=5x-1

use the substitution method since y = 4

4 = 5x-1

move - 1 to the other side

sign changes from - 1 to + 1

4+1 = 5x-1+1

4+1 = 5x

5 = 5x

divide both sides by 5 to get x by itself

5/5 = 5/5x

Cross out 5 and 5, divide by 5 and then becomes 1*1*x = x

x=5/5

Answer: x = 1

(1,4)