Jason spent half of his allowance going to the movies. he washed the family car and earned seven dollars. what is his weekly allowance if he ended with thirteen dollar ?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.