How to solve big questions of linear equation especially in decimals
A solution of 9% acid is to be diluted by adding 3% acid solution to it. The resulting mixture is to be more than 5% but less than 7% acid. If there is 460 L of the 9% solution, how many litres of 3% solution will have to be added?
Or
Solve the following system of linear inequalities graphically.
3x+2y≥24, 3x+y≤15, x≥4
Solve the following inequalities graphically in two dimensional plane:
y < -2