## Algebra 1

$-b-a\longrightarrow$ substitute the given values for each variable $=-7-(-4)\longrightarrow$ change subtraction to addition be reversing the sign of the following term $=-7+4\longrightarrow$ when adding a negative term to a positive term, subtract the absolute values; the sign of the sum is negative since the negative addend has the greater absolute value. $=-(|-7|-|4|)\longrightarrow$ simplify absolute values $=-(7-4)\longrightarrow$ subtract $=-3$