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the given number is then 700 80 n 780 n when reversed the new number is 100n 80 7 87 100n subtracting these two numbers we get after solving we get 693 99n the digit can be arranged in 3 ways or 6 ways we have already investigated 2 of these ways we can now try one of the remaining 4 ways one of these are n 95 100n 70 8 693 99n 199n 615 after solving we get n=3 answer the unknown digit is 3.
linear equations solver what is a linear equation an equation is a condition on a variable a variable takes on different values its value is not fixed variables are denoted usually by letter of alphabets such as x y z l m n p etc from variables we form expression linear equation in one variable these are the type of equation which have unique i.e only one and one solution for example 2 x 5 0 is a linear equation in one variable root of the equation is -52 example 1 convert the following equation in statement form x-5=9 solution 5 taken from x gives 9 so x 9 5 14
hence x 14 for verification of the statement x-5=9 14 5 9 9 9 so left hand side value is equal to right hand side value hence the value of x determined is correct you can try out some more examples from linear equations worksheets linear equation in two variable an equation which can be put in the form ax+by+c=0 where a b and c are real numbers and a and b are not zero is called linear equation in two variables for example 3 x 4 y 8 which is a equation in two variables summary a linear equation in two variable has infinitely many solutions.the graph of every linear equation in two variable is a straight line every point on the graph of a linear equation in two variable is a solution of the linear equation read more on what is the area of a parallelogram
an equation of the type y mx represents a line passing through the origin how to solve linear equations below are the methods for solving linear equations in one variable method 1 isolate the variable in this method we will isolate the variable on one side and number on other sides steps and example for solving equation example 1 solve 2x 3 =15 solution 1 given equation is 2x 3 15 step 2 subtract 3 from both side 2x 3 3 15 3 2 x =12 step3 isolate the variable by dividing 2 to both side 2x2 122 x=6 solution is 6