1.The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.
Let the cost of a notebook be Rs x and the cost of a pen be Rs y. Then, according to the given condition of the question, x = 2y ⇒ x – 2y = 0 This is the required linear equation in two variables x and y.
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2.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
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3.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
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4.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
- 2x + 3y = 6
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5.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
x = 3y
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6.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
2x = - 5y
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7.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
3x + 2 = 0
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8.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
y - 2 = 0
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9.Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
5 = 2x
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10. Express the following statement as a linear equation in two variables by taking present ages (in years) of father and son as x and y, respectively. Age of father 5 years ago was two years more than 7 times the age of his son at that time.