Temperature
Part of the Fundamentals section of Coddy's Math journey. Lesson 59 of 64.
Fahrenheit from Celsius: F = 9/5 C + 32. Water boils at 212 °F; what is that in Celsius? Substitute F = 212:
212 = 9/5 C + 32
Subtract 32 from both sides (180 = 9/5 C), then undo the fraction coefficient by multiplying by 5/9: C = 100. Water boils at 100 °C, as it should.
A two-step equation with a fraction coefficient, and the letter is on the right: everything from the last ten chapters in one line. Read the layers (multiply by 9/5, then add 32), undo them in reverse, and the formula answers the question.
Challenge
A warm day is 68 °F: 68 = 9/5 C + 32. Solve for C.
Try it yourself
Solve for C
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Fundamentals
1What an Equation Is
The EquationFinding the UnknownThe Same to Both SidesSolved Means AloneRecap: First Equations4Two-Step Equations
Two Layers to UndoSubtract, Then DivideAdd, Then DivideA Division InsideNegatives in Two StepsRecap: Two-Step Equations2One-Step Equations
Undoing AdditionUndoing SubtractionUndoing MultiplicationUndoing DivisionInverse OperationsRecap: One-Step Equations5Tidying First
Like TermsTerms and Numbers MixedThe Distributive PropertyDistributing a SubtractionTidy, Then SolveRecap: Tidying First