5x + 4y = 20
4y = 20 - 5x
y = 20/4 - 5/4x
y = 5 - 5/4x
The x intercept is when y = 0
0 = 5 - 5/4x
5/4x = 5
x = 4.5/5
x = 4
The y intercept is when x = 0
y = 5 - 5/4x
y = 5 - 5/4.0
y = 5
Answer:
3.5°/hour
Step-by-step explanation:
Rate of change of temperature=change in temperature/Change in time
Change in temperature
=82° - 54°
=28°
Change in time=3:00pm - 7:00am
=8:00 hours
Rate of change of temperature=28°/8 hours
=3.5°/hour
Cost per ounce means you take the cost and divide it by the cost:
<span>3.36 / (21/2) </span>
<span>division of fractions changes to the multiplication of the reciprocal: </span>
<span>3.36 * (2 / 21) </span>
<span>3.36 and has 21 as a factor, so let's cancel it: </span>
<span>0.16 * 2 </span>
<span>$0.32 per ounce</span>
