Apples and Pears!
9x + 8y - 4x + 5y
5x + 13y
x=2.5
3x - 7
0.5
x + 5 = 12
x = 7
8x2 = 32
x = 2 or x = -2
Expression vs. Equation
Expression - math phrase made up of numbers of variables connected by operations (no equal sign)
Equation - 2 expressions that are equal (equal sign)
3x2 + 2y2 - 2x2 + 4y2
x2 + 6y2
x= 1/3
6x2 - 7x + 12
31/3
y - 4 = 5
y = 9
4(x+4) = 24
x = 2
Coefficient
a number written beside a variable tells you to multiply by that number
6xy + 6x2 + 10yx + 2y2 - 4xy
6x2 + 12xy + 2y2
x=10
(3/5x + 7)x
130
t + (-2) = 6
t = 8
4x - 3 = -8x + 57
x= 5
An expression with 3 terms
(x - 3x2) + (5x2 + x - 11)
2x2 + 2x - 11
x=7 y=3
9x5 - 8xy + 4y3 + 6
151137
10 x - 15 x = 43 + 32
x = -15
3(x-1) - 5 = -11
x=-1
Polynomial
an expression with one or more terms
(y2 - 2y + 7) - (12y2 + 8y + 10)
-11y2 - 10y - 3
n= -2/3
4 + 3n - 2n2
10/9
14x - (-2x) = -25-23
x = -3
x+ ((4x+2)/6) = 5
x=14/5
Degree of a term
the sum of the exponents in the term