Answer:
13
Step-by-step explanation:
Mean would mean average, which in this case is 
so your equation would look like 
Next multiply both sides by to clear the fraction 
to get 
Subtract 69 from both sides 
you get 
Hello :
<span>4x-5y=13...(1)
x+5y=-3...(2)
(1)+(2) : 5x = 10
x=2
subsct in (2) : 2+5y = -3
5y =-5
y = -1
</span>
Answer:
x=-1 and x=1
Step-by-step explanation:
all you have to do is replace the letters with numbers and
8(11 + 2r) = 126r + 3
first open the parenthesis
88 + 16r = 126r + 3
88 - 3 = 126r - 16 r
85 = 110r
divide both-side of the equation by 110
85/110 = r
r= 17/22