Ch 3 Functions
If f(x) = 3x + 5, what is the value of f(-2)?
f(-2) = -1
What is the slope of the line represented by this table?
(See picture)
4
What is the formula for point-slope form?
y-y1=m(x-x1)
Solve using substitution:
y = 2x
3x+y = 15
(3, 6)
Solve using elimination:
x + y = 4
2x - y =5
(3, 1)
If f(x) = 3x2 -5x+8, what is the value of f(1)?
f(1) = 6
What is the slope of the line represented by this graph?
(See picture)
-3
Write the equation of the line in slope-intercept form that goes through (2, -3) and has a slope of 4.
y = 4x - 11
Solve using substitution:
y = x-4
5x+2y = 12
(3, -1)
Solve using elimination:
x + 2y = 4
x + 4y =-8
(16, -6)
If f(x) = 3x2 +5x - 8, what is the value of f(-2)?
f(-2) = -6
What is the slope of the line that goes through the points (-2, 5) and (-1, -4)?
-9
Write the equation of the line in slope-intercept form that goes through (4, -1) and (2, -2)
y = 1/2 x -3
Solve using substitution:
x = 2y+4
3x-4y = 20
(12, 4)
Solve using elimination:
4x+6y = -6
3x - 2y = 2
(0, -1)
Rewrite this equation in slope-intercept form:
3x - 6y = 12
y = 1/2x - 2
Write the equation of the line shown in the table.
(see picture)
y = 2x+7
Write the equation of the line in slope-intercept form that is parallel to x + y = 4 and goes through (-3, 2).
y = -x - 1
Solve using substitution:
3x+y=4
6x+2y = -8
No Solution
Solve using elimination:
4x+3y = 8
x - 2y = -9
(-1, 4)
If f(x) = 3x + 5, what is the value of x when f(x)=-10?
x = -5
Write the equation of the line shown in the graph.
(see picture)
y = 8x + 30
Write the equation of the line in slope-intercept form that is perpendicular to y = 3x+7 and goes through (6, 1).
y = -1/3x + 3
Solve using substitution:
x-3y=-5
3x-2y = 6
(4, 3)
Solve using elimination:
4x + 3y = 15
3x + 5y = 3
(6, -3)