Making an unknown a subject

Question 1

What do you mean by making an unknown the subject

2x + y = 4

Answer 1

It means to form an equation where the unknown is on one side of the equation and what it is equal to on the other side

For 2x + y = 4

y = 4 -2x

x = (4 - y)/2

Question 2

Make x the subject

xy = 4

Answer 2

x = y/4

Question 3

Make y the subject

xy = 4

Answer 3

y = x/4

Question 4

Make y the subject

y + 2x = 4

Answer 4

y = 4 - 2x

Question 5

Make x the subject

y + 2x = 4

Answer 5

2x = 4 - y

x = (4 - y)/2

Question 6

Make x the subject

y - 2x = 4

Answer 6

2x =y - 4

x = (y - 4)/2

Question 7

Make y the subject

y - 2x = 4

Answer 7

y = 4 + 2x