Answer:
y= 3.5x+22.5
Step-by-step explanation:
The standard equation of a line a expressed as y = MX+c
m is the slope
c is the y-intecept
Get the slope
m = y2-y1/x2-x1
m = -9-5/-9+5
m = -14/-4
m = 7/2
Get the y- intercept
Substitute any of the point say (-5,5) and m = 7/2 into the equation y = MX+c
5 = 7/2(-5)+c
5= -35/2+c
5 =-17.5+c
c = 5+17.5
c =22.5
Get the required equation
Recall that y = MX+c
$6.48
$1.50 × 4 = <u>$6.00</u>
for sales tax, $6.00 × 0.08 = <u>$0.48</u>
$6.00 + $0.48 = <u>$</u><u>6</u><u>.</u><u>4</u><u>8</u>