What is the value of x?

enter your answer in the box

x=

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28