9 is the answer!!!!!!!!!!!!!!!!!!!!!!
Given <span>20 yards for $30.00, unit rate = $30 / 20 yards = $1.5 per yard
Given 40 yards for $45.00, unit rate = $45 / 40 yards = $1.13 per yard
Given 50 yards for $70.00, unit rate = $70 / 50 yards = $1.4 per yard
Given 65 yards for $85.00, unit rate = $85 / 65 yards = $1.31 per yard
The best deal is the cheapest rate which is 40 yard for $45.00
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2) 9=-7m+1-6
9=-7m-5
9+5=-7m
14=-7m
m=14/-7=-2
5) -36=6(2-8n)
-36/6=2-8n
-6=2-8n
-6-2=-8n
-8=-8n
n=1
