× + 2y ≥ 43× - 4y < 6

Sss postulate -
this states that if three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent. 

sas postulate -
this states that if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.

asa postulate -
this  postulate states that if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent. 

let n = ratio

math equation:

4n + 5n = 27

solve for n:

4n + 5n = 27

9n = 27

n = 3

solve and check for two numbers

substitute n

4n + 5n = 27

4(3) + 5(3) = 27

12 + 15 = 27

27 = 27 true

answer: the two numbers are 12 and 15.