Question

solve the following:
if 2x + y =20 then the value of y is 10 ,then x ?​

Answer 1

Step-by-step explanation:

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We have 2x+y=20

Putting y=1 in the equation

2x+1=20

2x=20–1

2x=19

x=19/2

x=9.5

Answer 2

Given

We have given an equation 2x+y = 20

and value of y is 10

To Find

We have to find the value of x

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

Since,y is given and an equation is given and have to find x so, we can easily find out the value of x by putting y's value into an equation and evaluate it.

➙2x+y= 20

put y into the Equation

➙2x+10=20

shift constant term to the constant side

➙2x= 20-10

➙2x= 10

Now,move 2 which is being multiplied with variable x to constant side

➙x= 10÷2

➙x= 5

Hence,value of x is 5

Check:

➙2x+y= 20

➙2(5)+10

➙10+10

=20

Since,LHS = RHS (verified)