Answer:
y = - 
Step-by-step explanation:
=
( cross- multiply )
4y = - 7 ( divide both sides by 4 )
y = - 
Answer:
20m
Step-by-step explanation:
The rooms are 4m x 5m.
To find the area, multiply length by width: 4*5=20
-6-y / 3-7 = -2/3
-6-y / -4 = -2/3
Multiply through by -12:-
3(-6-y) = 8
-18 - 3y = 8
3y = - 26
y = -8 2/3