
Answering Algebra
 
Let's see how you got on:
 y  4 = 10
Add 4 to both sides: y  4 + 4 = 10 + 4
Answer: y = 14
 17  b = 5
Add b to both sides: 17  b + b = 5 + b
So: 17 = 5 + b
Subtract 5 from each side: 17  5 = 5 + b  5
Answer: 12 = b
 50  2a = 30
Add 2a and subtract 30 from each side:
50  2a + 2a  30 = 30 + 2a  30
50  30 = 2a
20 = 2a
Answer: a = 10

Once you get used to this, you don‘t need to write all the steps given above:
e.g. y  4 = 10
y = 10 + 4 = 14
