Question

verify by substitution that the root of 3y-7=8 is y =5​

Answer 1

3x−5=7

Given root x=4

LHS=3(4)−5=12−5=7

RHS=7

LHS=RHS

∴x=4 is the root

Answer 2

• We have to evaluate the above expression by using the given data.

              Given data:- $y=5.$

              To find:- Value of the expression $3y-7=8.$  

              Solution:-

•  To solve the above equation we will follow the BODMAS rule.

• BODMAS is an order of mathematic operations.

• BODMAS rule is to be followed while solving expressions in mathematics. It stands for,

           B= bracket

           O= order of power or rules

           D= division

           M= multiplication

           A= addition

           S= subtraction

    Now put the value of y in the given equation we get,

         $3y-7=8\\\Rightarrow 3(5)-7=8\\\Rightarrow 15-7=8\\\Rightarrow 8=8\\\Rightarrow \frac{8}{8}\\\Rightarrow 1.$

     Hence we will get the value $1.$