Name 3 methods that we can use to solve system of equations
By Graphing, Substitution, Elimination
y = 3x +2 y = 3x - 3 These lines are...
Parallel
Find the common difference: -34, -29, -24, -19, ...
d = 5
What is the definition of function?
Every input has only ONE output
What slope is perpendicular to: m = 3
-1/3
If a system of equations has no solution, what does the graph look like?
parallel lines
Is it a function? (2, -2) (5, 9) (5, -7) (1, 4)
No
Solve for x and y. y = 2/3x - 2 & y = -x + 3
(3, 0)
System of equations with the intersecting line have _____________ solutions.
one
A line is perpendicular to y = 2x - 7. What is the slope of this line?
-1/2
Is the sequence arithmetic: -3, 3, -3, 3, ...
no
When graphing inequalities, shade _______________ if y > or ≥ the expression, shade ________________ if y < or ≤ the expression.
above ; below
What variable can be used to represent correlation coefficient?
r
Write out an equation that is PARALLEL to the following line: y = 2/9x - 7
y=2/9x+7 (same slope)
Graphing Inequalities: If the inequality is < or >, use a __________ line. If the inequality is ≤ or ≥, use a _____line
dotted; solid
Arithmetic Sequence – sequence of numbers that increases or decreases by a constant rate, called the ____________
Common difference
Write the recursive formula for 4, 8, 12...
an=an-1+4
What slope is parallel to: m = 4
4
Systems of equation with the same line have _____________ solutions.
infinite
Score on science exam and number of words written on the essay question. r=.28. Explain the strength of correlation
week positive
Systems of equations that are parallel lines have _______ solutions
no/zero
Parallel lines - ______________ intersect, have _______________ slope
never; same
Perpendicular lines – Intersect at _____________________, have ______________________________ slopes
right angle; opposite reciprocal
Given the sequence: 25, 21, 17, 13,... Write the explicit equation that models the sequence. (Hint: Simplify your equation.)
an = -4n + 29