For each of these, make y the subject
a.) b - y = x b.) 11 + 2y =7x c.) y/3 = 7x + 3
Hello I am strugling on these questions, I did a lesson on them last week and I understud them but now there in a different form and I'm confussed. can someone show me how to do these?
1 Answer | Add Yours
When we are trying to make y the subject, it just means that we are solving the equations for y. In other words, we need to get y on the left by itself.
For the first one, b - y = x
First we want to move the b to the right side by subtracting b from both sides
- y = x - b
Now, we need to multiply both sides by -1 to get
y = - x + b
which leaves y as the subject.
For the second one, 11 + 2y = 7x
subtract 11 from both sides
2y = 7x -11
divide both sides by 2
y = 7/2 * x - 11/2
For the third one, y/3 = 7x + 3
we need to multiply both sides by 3 to cancel it out
y = 21x + 9
Join to answer this question
Join a community of thousands of dedicated teachers and students.Join eNotes