The sum of two numbers is 18 and their difference is 8

13 and 5

Step-by-step explanation:

x+y=18

x-y=8

2x=26

x=13

So the first number must be 13

13+y=18

y=5

And the second number must be 5

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

1 1/5

step-by-step explanation: