Let boys be x and girls y. The equations are x + y = 10 and y – x = 4. Graphing both lines reveals their unique intersection point at (3, 7). Thus, 3 boys and 7 girls participated.
Ganita Manjari class 9 part 2 maths Chapter 13 questions answer
Ganita Manjari class 9 part 2 maths Chapter 13 Two Variables, One Line solutions
Let x denote the number of boys and y denote the number of girls. The problem yields two linear equations: x + y = 10 and y – x = 4. Plotting x + y = 10 passes through (0, 10) and (10, 0), while y – x = 4 passes through (0, 4) and (6, 10). The two straight lines intersect precisely at (3, 7), giving 3 boys and 7 girls.
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