I need help with this question please show the work

Step-by-step explanation:

5+3y=12

3y=12-5

3y=7

y=7/3

y=mx+b

step-by-step explanation:

m slope

b y-intercept

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.