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
5 = 2x -2x + 5 = 0 -2x + 0.y + 5 = 0 Comparing with ax + by + c = o, we get a = - 2, b = 0, c = 5
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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.