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solve the equation 11=y-9

solve the equation 11=y-9

what is the solution

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Christopher G. | Math Tutor - Algebra, Trig, Calculus, SAT/ACT MathMath Tutor - Algebra, Trig, Calculus, SA...
5.0 5.0 (3 lesson ratings) (3)
4

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! 

Sonia A. | Reach for the stars, but keep your feet firmly planted on the ground.Reach for the stars, but keep your feet ...
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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

 

Noreen M. | Together WE WORK TO SUCCEEDTogether WE WORK TO SUCCEED
0

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

Daniella G. | Recent Graduate in Microbiology, looking to tutor in the sciencesRecent Graduate in Microbiology, looking...
4.7 4.7 (3 lesson ratings) (3)
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looks like you're just solving for y... in which case, add nine to both sides and you get y = 20