Answer:
x=-1/2+y/2
Step-by-step explanation:
Answer:
Eva's age is 44 years
Step-by-step explanation:
Let
x ----> Brita's age
y ----> Eva's age
we know that
The sum or their ages 118
so
----> equation A
The difference in age between Brita and her daughter Eva is 30 years
so
----> equation B
Solve the system by elimination
Adds equation A and equation B

<em>Find the value of y</em>
substitute the value of x in any equation

therefore
Eva's age is 44 years
To find the answer of the first one, plug in numbers for x, and see if they make the inequality true. Like, 5, 6, and 7.
For the second one, add 13 to both sides. The answer is 21.
That would be : 3:5 = 12:20....because 3/5 = 12/20