Changing The Subject

Question 1

Y= M-3

Make M the subject.

Answer 1

Y= M +3

+3

Y+3= M

M= Y+3

Question 2

G= 5M

Make M the subject.

Answer 2

G= 5M

Divide by 5

G/5 = M

M= G/5

Question 3

Make R the subject

C= 2 πr

Answer 3

C = 2 πr

Divide by 2

C/2 π = R

R= C/ 2 π

Question 4

Make L the subject

P= 2L+ 2W

Answer 4

P= 2L+ 2W

-2W. -2W

P-2W = 2L

Divide by 2

P-2W/2 = L
L= P-2W/2

Question 5

Make n the subject of the formula

M=5n-21

Answer 5

M= 5n-21

+21. +21

M+21=5N

/5 /5

M+21/5 = N. N= M+21/5