Answer:
this is only one functions, it means all is correct.
20x+5y=120
10x+7.5y=80 multiply this one by 2
___________
20x+5y=120
20x+15y=160 subtract
___________
-10y=-40 divide both sides by -10
____________
y=4
20x+5(4)=120 plug 4 in for y in the first equation
20x+20=120 multiply
20x=100 subtract
x=5 divide to find x
Answer: Spinning a spiner
Step-by-step explanation:
(Trust me)
Answer:
27 vertical posts and 36 horizontal rails
Step-by-step explanation:
If Max builds 1style of fence with each section having 3vertical posts and 6horizontal rails, to calculate the number of posts and rails that he need for a fence that will be 9 sections long, we will use the following equality;
For Posts:
1section = 3 vertical posts
9 sections = x
Cross multiply
x × 1 = 9× 3
x = 27
Hence Max will need 27vertical posts for a fence that is 9sections long
For the rail:
1 section = 6 horizontal rails
6 sections = y
Cross multiply
y× 1 = 6 × 6
y = 36
Hence Max will need 36 horizontal rails for a fence that is 9sections long.
In total Max will need 27 vertical posts and 36 horizontal rails for a fence that is 9sections long
