How can i find what y and w will equal to? what do they equal to?

The ratio of two numbers is 5 to 4. the sum of the numbers is 99. what number is the greater of the two numbers?

How do you use the elimination method for this question? explain, because i really want to understand!

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area