Answer:
1. a=20
2. a=17
3. x=12 y=4
Explanation:
set them equal to each other for each figure, the first one is 6a+10=130 therefore 6a=120 if you subtract 10 from each side. then you divide by 6 to get a=20.
For the next one set them equal again to get 4a-4=2a+30 first you add 4 to each side to get 4a=2a+34 then you subtract 2a from each side to get 2a= 34 then you divide by 2 to get a=17
Last one you have to set 6y+1 equal to 4y+9 because they are equal distance. you get 6y+1=4y+9 then you subtract 4y to get 2y+1=9 then you subtract 1 to get 2y=8 then you divide by two and get y=4
For the second variable of the last equation you set the remaining two equations equal to each other to get 2x-5=x+7 then you subtract x from both sides to get x-5=7 then you add five to each side to get x=12 so your final answer for the last question is x=12 y=4
Hope this helped ;)