Find the intercepts for this equation. x+2y=10

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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.'

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?