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Start by using the equation of a line, $y=mx+b.$ The coefficient in front of $x$ is the slope, $m,$ and the constant is the $y$-intercept, $b.$ Note that both $m$ and $b$ are both constants, so $x$ is not included in $m.$

b

We use the same reasoning as in the previous part of the exercise. If we compare $y=-4.5x−12$ with the equation of a line, $y=mx+b,$ we see that $m=-4.5$ and $b=-12.$

c

We repeat the same process, but here we first need to identify the coefficient in front of $x.$ By writing the term as $1x$ we can see that that $m=1$ and $b=1.$