Question

Make n the subject of the formula

m = 5 n - 21

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Can someone please help and explain!!
Incorrect or incomplete answers will be reported

Answer 1

`\mathsf{ (m + 21)/(5) = n }`

Explanation:

To make "n" the subject of the formula, rearrange the formula so it begins with " n = "

To isolate the variable "n", you need to inverse the other terms on that side of the equation where "n" really is.

=> m = 5n - 21

• there's a "-21" next to "5n", inverse of subtraction is addition, so add 21 on both sides of the equation.

=> m + 21 = 5n - 21 + 21

=> m+ 21 = 5n

• There's also a 5 attached to n, that means the multiplication of n with 5, the inverse of multiplication is division, so dividing both sides of the equation by 5

`\mathsf{ (m + 21)/(5) = n }`