Answer: The picture.
<em>Note: I originally said that the picture was reversed, but it actually isn't.</em>
Step-by-step explanation:
Start by making a graph and labeling the axis. The function is linear and has a slope of 1/1, since there is no numerical value in front of the -x. It is also negative, which is the reason the graph is reversed. Then you need to go up 2 on the y axis, since it is -x+2. Your point will be at (0,2)
After you have graphed your first point, graph a second point to help you draw the line. To do this move down on point and to the right one point or (1,1). <em>Keep in mind that if the graph was positive you would move up and to the right.</em>
Now on to drawing the line. Draw the line dashed since y is greater than, but not equal to -x+2. After you have dashed the line, shade above the line to show that it is greater than.
Answer: ab =6
have:
=> a + b + 1 = ab
⇔ a + b + 1 - ab = 0
⇔ b - 1 - a(b - 1) + 2 = 0
⇔ (b - 1)(1 - a) = -2
because a and b are postive integers => (b - 1) and (1 - a) also are integers
=> (b - 1) ∈ {-1; 1; 2; -2;}
(1 -a) ∈ {-1; 1; 2; -2;}
because (b -1).(1-a) = -2 => we have the table:
b - 1 -1 1 2 -2
1 - a 2 -2 -1 1
a -1 3 2 0
b 0 2 3 -1
a.b 0 6 6 0
because a and b are postive integers
=> (a;b) = (3;2) or (a;b) = (2;3)
=> ab = 6
Step-by-step explanation: