IDNStudy.com, kung saan ang iyong mga tanong ay natutugunan ng mabilis na sagot. Ang aming platform ng tanong at sagot ay idinisenyo upang magbigay ng mabilis at eksaktong sagot sa lahat ng iyong mga tanong.

A certain class consists of 45 grade 8 students. The no. of boys is 9 more than the no. of girls. How many boys and girls are there? (Solving systems of linear equations using elimination method)

Sagot :

sol. let x  be the number of girls
            y be the number of boys

           x + y = 45
           y = x + 9
        x + x + 9 = 45
         2x = 45 - 9
         2x = 36     or x = 18
   Therefore : girls = 18
                     boys = 27
      

Let x = no. of girls
x + 9 = no. of boys

x + x + 9 = 45
    2x + 9 = 45
2x + 9 -9 = 45 - 9
         2x  = 36
    2x ÷ 2 = 36 ÷ 2
            x = 18 - no. of girls
      x + 9 = 27 - no. of boys