Find the value of the variable that makes each equation true.

1. $4k + l = −7$

   Step 1(a):

   If $4k + 1 = −7$, then $4k = −8$.
   Why does this make sense?

   Step 2(a):

   If $4k = −8$, what must $k$ be equal to?
   Try setting up a diagram to figure it out.

   Answer (a):

   $k = −2$

2. $30 − 5x = 10$

   Hint (b):

   What do you need to subtract from $30$ to get $10$?
   How can you use this to help figure out the value of $x$?