Problems that lead to equations to solve
In a formula, the arrangement is that the single variable is written on the left-hand side of the equals sign. For example,
v = u + at
v is known as the subject of the formula.
The all the values are provided with the exception of v, by substituting the values, the value of v will be calculated.
Similarly, if all values with the exception of t is provided, here we will work out the value of t by substituting the values and rearranging the formula to solve it.
For example, if v = 21, u = 6 and a = 2, what is t?
Substituting the into the formula gives the following equation,
21 = 6 + 2t
6 + 2t = 21 (swap both sides)
2t = 15 (subtract both sides with 6)
t = 7.5 (divide both sides with 2)