The absolute value equation which could be used to obtain the greatest and least possible temperature values when the temperature reading is 17°F is (17 ± 2)°F
- Thermometer accuracy = ±2°F
- Thermometer reading = 17°F
<u>The least possible value of </u><u>temperature</u><u> </u><u>can</u><u> </u><u>be</u><u> </u><u>calculated</u><u> </u><u>thus</u> :
- Thermometer reading - thermometer accuracy
<u>The highest possible </u><u>temperature</u><u> </u><u>can</u><u> </u><u>be</u><u> </u><u>calculated</u> thus :
- Themometer reading - thermometer accuracy
Hence, the absolute value equation which represents the scenario is (17 ± 2)°F
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Constant of proportionality is given by: y=kx oy 
So lets suppose y = 50 and x = 5 so k will be 
This 10 will remain constant. For every $50 Michael saves $5, for $100 he will save $10 , for $150 he will save $15 and so on.
So this 'k' will be same for each value of x and y.
Y = (3/4)x + 1<span>y = 0.75x + 1 is also an acceptable answer</span>