Question

a person bought 5 pencils and 7 pens together at cost ₹65. express this in the form of linear equation​

Answer 1

Step-by-step explanation:

Given:-

A person bought 5 pencils and 7 pens together at cost ₹65.

To find:-

Express this in the form of linear equation ?

Solution:-

Let the cost of one pencil be ₹ X

Total cost of such 5 pencils = ₹ 5X

Let the cost of one pen be ₹ Y

Total cost of such 7 pens = ₹7Y

Given that

A person bought 5 pencils and 7 pens together at cost = ₹65.

=> 5X + 7Y = ₹ 65.

=> 5X+7Y-65 = 0

Answer:-

The required linear equation in two variables is

5X+7Y -65 = 0

Additional information:-

• An equation of the degree 1 is called linear equation.
• The standard form of a linear equation in one variable is ax+b = 0
• A linear equation has two variables is called a linear equation in two variables.
• The standard form of a linear equation in two variables is ax+by+c = 0

Answer 2

Given :- A person bought 5 pencils and 7 pens together at cost ₹65.

To Find :- Express this in the form of linear equation ?

Answer :-

Let cost of 1 pencil is Rs.x and cost of 1 pen is Rs.y .

so,

→ cost of 1 pencil = x

→ cost or 5 pencils = x * 5 = Rs.5x

and,

→ cost of 1 pen = y

→ cost or 7 pens = y * 7 = Rs.7y

given that, total cost is Rs.65 .

therefore,

→ cost or 5 pencils + cost or 7 pens = 65

→ 5x + 7y = 65 = Required linear equation .

Hence, the linear equation of given expression is 5x + 7y = 65 .

Learn more :-

let a and b positive integers such that 90 less than a+b less than 99 and 0.9 less than a/b less than 0.91. Find ab/46

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