Question

The formula for converting degrees Celsius (C) to degrees Fahrenheit (F) is F = (9/5)C + 32. Solve the formula for degrees Celsius (C). Then find the temperature in degrees Celsius (C) when the temperature in degrees Fahrenheit (F) is –4.
a.
–20° C
b.
–29° C
c.
–14° C
d.
–7° C

Answer 1

you are given F = (9/5)C + 32
to isolate C, think about what is being done to C; it's added to 32 and multiplied by 9/5

so to isolate C, we have to do the opposite: subtract 32 first, then divide both sides by (9/5)

after that simply plug in F = -4 to find the solution