Distribute
4(2x-3)
8x-12
2+x=9
x=7
Order of Operations:
"PEMDAS"
3w+7=19
A repair bill for a car is $648.45. The parts cost $265.95 and labor is $85/hour. Write an equation to find hours of labor it took to repair the car?
648.45=265.95+85h; 4.5hrs
-2(9+4x)
-18-8x
3x=27
x=9
How do you get the perimeter?
Add all sides together
2g-13=3
g=8
Nine years from now Jack will be 3 times as old as he was 11 years ago. How old is he now?
J+9=3(J-11)
J+9=3J-33
J=21
-3(6z-10p)
-18z+30p
1+9x=37
X=4
Equilateral Triangle
All sides equal.
24=13n-4n+9
n=5/3
The altitude "a" (in feet) of a plane "t" minutes after liftoff is given by a=3400t + 600. How many minutes after liftoff is the plane at an altitude of 21,000 feet?
6 Min.
7z-1(-3x+2z)
3x+5z
-9-4x=11
x=-5
Definition of Solution
A solution is an assignment of values to the unknown variables that makes the equality in the equation true
4(z+5)=32
z=3
Dan is 14 years older than Margaret. 8 years ago Dan was 3 times as old as her. Find their current age.
M+14-8=3(M-8)
M=15
D=29
3(z-9)+2(z+3)
5z-21
x=12
Definition of Ratio?
A ratio is a method of comparing two or more numbers or variables
6+5(m+1)=26
m=3
Andy is 7 years older than his wife Lori. If Andy and Lori's ages add up to 51, how old are Andy and Lori?
L+L+7=51.
22 and 29