Solving two-step linear equations using multiplication and division x/a+b=c

Lessons

1. Find x in the equation modelled by each diagram.
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2. Solve.
   1. $3 + \frac{x}{4} = 51$
   2. $17 = 10 + \frac{x}{{ - 2}}$
   3. $\frac{x}{{ - 6}} - 21 = - 9$
   4. $- 1 = 23 + \frac{x}{8}$
3. The amount of time needed for an ice cube to melt when the temperature is between 10 °C to 30 °C can be expressed by the equation $t = 16 - \frac{C}{2}$, where t is the amount of time for the ice cube to melt in minute; and C is the temperature in degree Celsius.
   1. Will the ice melt in 10 minutes if the temperature is 10 °C?
   2. What was the lowest temperature for the ice cube to melt in 5 minutes?