Question

find the value of B={x|x € N, x is divisibor by 7 and x <30}​

Answer 1

Step-by-step explanation:

Answer:

\large \bold \color{blue}{x = 2 \: \: \: \: y = 3}

Step-by-step explanation:

\bold{given} \\ \\ \bold{2x + y = 7..... < 1 > } \\ \\\bold{ x + 2y = 8..... < 2 > } \\ \\ < 1 > - 2( < 2 > ) \\ \\ \bold{(2x + y) - (2x + 4y) = 7 - 16} \\ \\ \bold{ - 3y = - 9} \\ \\ \bold{y = 3} \\ \\ sub \: \: in \: \: < 1 > \\ \\ \bold{2x + 3 = 7} \\ \\ \bold{2x = 4} \\ \\ \bold{x = 2} \\ \\ \large \bold \color{blue}{x = 2 \: \: \: \: y = 3}