Answer
$-7x+28y$
Work Step by Step
RECALL:
The distributive property states that for any real numbers $a, , $ and $c$,
$a(b-c) = ab-bc$
Use the distributive property to have:
$-7(x-4y)
\\=-7(x) -(-7)4y)
\\=-7x-(-28y)
\\=-7x+28y$