If we multiply the top equation by -4 we can get rid of the x so:
-4x+20y=-12
4x-4y=12
Add these up
16y=0
Y=0
X=3
Answer:
There were 6 guides on Sunday.
Step-by-step explanation:
Same ratio
On Saturday, 120 tourists and 18 guides.
On Sunday, 40 tourists and x guides.
Due to the same ratio:





There were 6 guides on Sunday.
y=40
a line is 180 degrees and the other side is 70 that means 110 =2y+x so x=30 then you fill in the x. 2y+30=110 you subtract 30 from 110 and get 80 then divide 80 by 2 and get 40