How many solutions does this system of equations have? Explain your reasoning.

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −