This is the basic and exam oriented question from linear equations in two variables in which we have given two equations 2x+3y=7, (a+b+1)x+(a+2b+2)y=4(a+b)+1 and we have to find the value of a and b for which the following equations has infinite solutions

RS Aggarwal, Class 10, chapter 3D, question no 24

Hope it helps you.