The rule is y= 2x-7. What is the input if the output is 19.

Answer 1

13 is the input if 19 is the output

y=2x-7 y=19

19=2x-7

2x = 19+7 = 26

x = 26/2 = 13

Answer 2

y = 2x - 7 rearrange to solve for x by adding 7 to both sides, and dividing by 2

(1/2)(y+7) = x now, plug in (you could have plugged in for y first and solved, but there are lots of advantages in just manipulating the variables - not the least of which being that you now have a formula for x in terms of y and don't need to repeat the algebra if you have the same problem for a different y value)

1/2 * (19 + 7) = 13

Please consider a tutor. Take care.