Which of the following are equations with a variable? (a) 12 = x – 5 (b) 2x > 7 (c) x/2= 5 (d) 5 + 7 = 3 + 9 (e) 7 = (11 x 5) – (12 x 4)
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a,d.e
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to find : according to question we are asked to find equations with variables.
Now , what are variables ?
A variable is a letter or symbol used to represent a quantity that can change. Any letter can be used, but x and y are common.
we are given with following equations to find variables :
(a) 12 = x – 5 , in this equation we have ' x ' as variable .
(b) 2x > 7 , here we have ' x ' variable.
(c) x/2= 5 , here also ' x ' is the variable
(d) 5 + 7 = 3 + 9 , in this equation there is no variable as above .
(e) 7 = (11 x 5) – (12 x 4) , this equation doesn't contain any variable.
hence , only equation a , b and c contains variable.
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