Expressions, Equations, and Functions.
Solve: 4(6n+7)
When n=6
172.
Simplify: 3x−2y+x−3y−7
4x−5y−7
Identify the slope and y-intercept:
6x+3y=18
m=-2;b=6
Solve the linear system: 5x+y=4, 6x-y=7
x=1, y=-1 or (1,-1)
3 times the difference of a number m and 15 is equal to 30 (as an expression)
3(m-15)=30.
Simplify:
-7x(x-13)
-7x2+91x.
X-intercept and Y-intercept: -2x+5y=-20
x-intercept=10; y-intercept=-4
Solve for k.
9/10 = 10/k
k= 100/9
Is x=8 a solution for 2x+10<4x-7?
No, x=8 is NOT a solution. 26<25 does not work!
-16-(-25.2)=
9.2
Solve for x: 16x-4=4(2x-3)
x=-1
Is the ordered pair a linear system? (8,5), 5x-4y=20, 3y=2x+1
No
You buy apples at $2 per pound and oranges at $3.50 per pound. What is an expression for the total cost of fruit purchased? Also, what is the total cost of 7 apples and 4 oranges?
2x + 3.50y = c ; c= 28
An elevator moves at a rate of -5.8 feet per second from a height of 500 feet above ground. It takes 6 seconds for the elevator to make its first stop. How many feet above the ground is the elevator now?
465.2 feet
Equation of the line that passes through the point (-2,9) and has slope -2.
y=-2x+5
−x+4y=4
−x+3y=1
Is (8,3) a solution of the system?
YES!
A rectangular banner is 16 feet long and has an area of 80 square feet. What is the perimeter of the banner?
42 feet
True or False?
If a number is positive, then its opposite is negative.
True!
Equation in standard form of the line that passes through the two given points: (3,9) (1,1); m= 4
-4x+y=-3
Solve the linear system: 2x+9y=16, 5x=1-3y
x=-1;y=2 or (-1,2)