solve the equation 11=y-9
what is the solution
solve the equation 11=y-9
what is the solution
To solve this equation, we need to get y alone on one side of the equal sign. To do this, we need to move the - 9 over to the left side. This means adding 9 to both sides of the equation.
11 = y - 9
+ 9 + 9
20 = y - 9 + 9
The - 9 and + 9 cancel out to 0, so we get 20 = y.
To check, we can always plug the value we get for the variable into the original equation.
11 = y - 9 -> 11 = 20 - 9 -> 11 = 11 It checks out!
11=Y-9
You need to get the variable by itself, so you must remove the 9 from that part of the = sign to the other side since there is a number there without a variable. To do this you must add 9 to both sides of the equation. You are left with
11 + 9 = Y
Add 11 and 9 to get 20.
So 20 = Y
old fashion
11=y-9
when you cross over the bridge (=) the sign changes
take the -9 over the bridge
11+9 = y
20=y or y=20
ANSWER Y=20
Proof
11+9 = y
when Y = 20
then 11+9 = 20
20 = 20
or 11 = y-9
substitute Y = 20
you get
11 = 20-9
11 = 11
looks like you're just solving for y... in which case, add nine to both sides and you get y = 20