Test 2 review: 9/27-10/13

One solution

different slope, different y-int, “intersect at one point”

No solution

same slope, different y-int, “run parallel→ never intersect”

Infinite Solutions

same slope, same y-int, “same line → intersect infinitely”

What are 3 methods to solve a system(s)

graphing, substitution, elimination

What is the first step in solving by elimination?

eliminating a variable (x, y, or z)

What is the first step in solving by substitution?

plug into whatever variable it gives you

What are key words to tell you what x is in a word problem?

each & per

How to set up 3 system equations in a calculator:

How do I know when a system of equations yields infinite solutions when solving algebraically? How do these lines look graphically?

1. both sides equal eachother

2. arrows

How do I know when a system of equations yields no solution when solving algebraically? How do these lines look graphically?

1. 0= #

2. # doesnt equal #