Answer
-5
Work Step by Step
To find the missing coefficient, transform the second equation such that the right side is -25.
$x\leq-5\longrightarrow$ multiply both sides by -5; reverse the inequality
$x\times-5\geq-5\times-5\longrightarrow$ multiply
$-5x\geq25$
The missing coefficient of x is -5.
