Answer:
1. 3x+3y=9 since it is a coinciding line.It is equivalent because all the terms are multiplied by 3 from the original equation.
2. x-4=3x+4
x=3x+8
-2x=8
x=-4
y=-4-4
y=-8
please mark me brainlyest <i cant spell it i think i spelled it wrong lol >
240 days is 4 times the half-life, which means that a sample of 1000 mg will decay to

after 240 days.
Answer: The team won 100 games and losses 28 games
Step-by-step explanation:
Let the number of games won denoted by x and the games lost is denoted by y .
Given : A minor league baseball team plays 128 games in a season.
Team won 16 more than three times as many games as they lost.
Then, the system of equations, we have

We can rewrite equation (2) as 
Now, Eliminate equation (3) from (1), we get

Substitute the value of y in (2), we get

Hence, the team won 100 games and losses 28 games.
Answer:
Step-by-step explanation:
Oh great!
Answer:
This is done by stating descriptions of these terms.
Step-by-step explanation:
Undefinable terms are terms with no formal definitions. Formal definitions are obtained when specific words are used to define a term. In mathematics, specifically, Geometry words like line, point, and plane have no definite definition, So descriptions are used to identify them.
For example, in describing a point, we note that a point has no dimensions, it is usually denoted with a capital letter, and it indicates a position. Also in a coordinate plane, it is denoted with descriptions such as (u,v). Corresponding descriptions are given of other undefinable terms.