Реши уравнения. выполни проверку. 6*(b-3)=10-2*(b+2) 83+5*(y-3)=3*(8y-9)

1. 6 * (b – 3) = 10 – 2 * (b + 2);

6 * b – 6 * 3 = 10 – 2 * b – 2 * 2;

6b – 18 = 10 - 2b – 4;

 6b + 2b = 10 – 4 + 18;

8b = 24;

b = 24 / 8;

b = 3.

Проверка:

6 * (3 – 3) = 10 – 2 * (3 + 2);

6 * 0 = 10 – 2 * 5;

0 = 10 – 10;

0 = 0.

 2. 83 + 5 * (y – 3) = 3 * (8y – 9);

83 + 5 * y – 5 * 3 = 3 * 8y – 3 * 9;

83 + 5y – 15 = 24y – 27;

5y – 24y = -27 – 83 + 15;

-19y = -95;

y = -95 : (-19);

y = 5.

Проверка:

83 + 5 * (5 – 3) = 3 * (8 * 5 – 9);

83 + 5 * 2 = 3 * (40 – 9);

83 + 10 = 3 * 31;

93 = 93.