I struggle with, what is x, or the questions with any letter in, can somebody help me?

Step-by-step explanation:

always remember this

here x and y are variables means that they may change value of these 2

x and y are also unknown values which means we should find these values

2 and 2 are co efficient (A number used to multiply a variable)

9 is constant and it's value doesn't change

example

x+y=2

see this equation

it say that there is 2 unknown number which we add up we get 2

so now x=2-y

putting in x+y=2( value of x)

so we get 2-y+y=2

2=2

1 (this is value of x)

now value of y

put in x+y=2 (value of x)

1+y=2

y=2-1

y=1

so now put in x+y=2 value of x and y

1+1=2

so, converting firstly the mixed fractions to improper fractions and then "adding".

3/5

step-by-step explanation:

double number line is not a standard concept, so it must have been defined in your textbook. assume top line is numerator.