8th Grade Mental Math
17 * 3
51
There are _______ quadrants on a coordinate plane
4
What is slope?
The rate of change.
Is this a function?
(4,8) (3,6) (2,5) (4,8)
NO
Write an expression 17 less than thrice a number is 31
3x -17 = 31
26+98
124
What is the x value of the y-intercepts coordinates?
0. (0, y)
Conner eats 12 hotdogs in 6 mins. Brenda eats 8 hotdogs in 3 minutes.
If graphed, which person would have the steeper slope?
Brenda's slope would be steeper.
Move the equation into slope-intercept form.
2x + y =5
y = -2x +5
Evaluate the expression x3 - 2 x +5 for x = 20
7965
2(3+5)
16
Graph the system of equations and write the solution:
y= 2x+3
y= x + 2
(-1,1)
If a line is decreasing then it's slope is __________
Negative
y = 1/2x + 4: What is the slope?
1/2
What is the opposite of the opposite of the opposite of -32?
32
8(4-9)+12
-28
What is the formula for finding slope?
y2 - y1 Divided by x2 - x1
Mrs. Knoll had 30 loaves of bread and sold 3 loaves per hour. Write an equation to represent this.
y = -3x +30
y = x - 3: What is the y-intercept?
-3
Evaluate the given expression for x =25
(x2 + 5) / x+5
21
2(7-4)+(8-2)
What is the formula for slope-intercept form?
y = mx + b
When Timmy was first born, he weighed 8.5 pounds. Every month he gained 1.5 pounds. Write an equation in slope intercept form that represents this situation.
y = 1.5x + 8.5
What would the line x=5 look like?
A vertical line at 5 on the x axis.
Name all types of triangles based on sides and angles.
Equilateral, Isosceles, Scalene, Right angled triangle, Acute angled triangle, and Obtuse angled triangle.