x
y
y/2
xy/2xy/4
xy/2 + xy/4
+ x y
4
x y +
8
4
8
x3 y
x y
2
x y2
x y6
4
3
4
x
x-1x+1
x(x+1)
x(x-1)/2
+x(x+1)
x(x-1)/2
x x + 1 + x x - 1
2
x x + 1 + x x - 1
2
2
x 2 + x - x
2
2 x+ 2 2
x23 x+2
A p B H
D C G
E F
p-1
p
p/2
p2
p-1 p/2
p2 p-1 p+
p2 p - p+ 2
2
2p2 p - p+ 2
2
3p2 - p2
2
3 ( xy – x ) – 2 ( y – x ) – 4xy
3xy 3x 2y 2x 4xy– – + –
xy x 2y– ––
=
=
-4 ( xy + x ) – 2 ( -y – x ) – 3xy
-4xy 4x 2y 2x 3xy– + + –
xy 2x 2y– +–7
=
=
-4 ( -xy - x ) – 2 ( y – x ) + 3xy
4xy 4x 2y 2x 3xy+ - + +
xy 6x 2y+ -7
=
=
6x2 + 4x2x
=
(2)(3) (2)(2)
2x 3x 2+
2x3x 2+=
10x2 + 6x2x
=
(2)(5) (2)(3)
2x 5x 3+
2x5x 3+=
12x2 + 9x3x
=
(3)(4) (3)(3)
3x 4x 3+
3x4x 3+=
x + y = 603x + 2y = 160
22 (2)120
x = 40
35 - x ≤ 25 - x ≤ 25 - 35
- x - 10≤x 10≥
10 - x ≥ 25 - x ≥ 25 - 10
- x 15≥x - 15≤
15 - x ≤ 23 - x ≤ 23 - 15
- x 8≤x - 8≥
15 - x ≥ 23 - x ≥ 23 - 15
- x 8≥x - 8≤
y = 7 x - 1
xy
0 2 4 6 8
-1 13 27 41 55
y = 3 x - 5
xy
-3 -1 1 3 5
-14 -8 -2 4 10
y = 2 x + 5
xy
0 1 2 3 4
5 7 13 23 37
2
y = 2 x - 3
xy
-2 -1 0 1 2
5 -1 -3 -1 5
2
0 , -4
4 , 4
0 + 42
, -4 + 42
= 2 , 0
y = m x + c
x
y
c
y = m x + 5
x
y
5
y = m x + 5
x
y
5(2,7)
(6,11)
m = 11 - 76 - 4
= 42 = 2
y = 2 x + c
x
y(5,13)
13 = 2 5 + cc = 3
3(0,3)
m = 13 - 35 - 0
= 105 = 2
a x b + c
= a x b + a x c
a x b x c
= a x b x c
a + b + c
= a + b + c
a x b x c
= a x b x c