91影视

Loreen has a calligraphy business. The equation $C=1.8n+35$models the relation between her weekly cost, C, in dollars and the number of wedding invitations, n, that she writes.

鈸� Find Loreen鈥檚 cost for a week when she writes no invitations.

鈸� Find the cost for a week when she writes 75 invitations.

鈸� Interpret the slope and C-intercept of the equation.

鈸� Graph the equation.

Put $n=0$in the equation $C=1.8n+35$

$C=1.8\left(0\right)+35$

$C=0+35$

$C=35$

Put $n=75$in the equation $C=1.8n+35$

$C=1.8\left(75\right)+35$

$C=135+35$

$C=170$

The equation $C=1.8n+35$is in slope-intercept form $y=mx+b$

By comparison, we get, slope, $m=1.8$, which means that the weekly cost, C, increases by $1.80 when the number of invitations, n, increases by 1. The C-intercept means that when the number of invitations is 0, the weekly cost is $35.

Graphing the equation$C=1.8n+35$

Take two points to graph the line: localid="1645500840023" $(0,35),(10,53)$