## Algebra: A Combined Approach (4th Edition)

F = $\frac{9}{5}$C + 32 If F = C, F = $\frac{9}{5}$F + 32 F – $\frac{9}{5}$F = 32 -$\frac{4}{5}$F = 32 F = 32 x -$\frac{5}{4}$ F = -40°