How do you simplify -7 (-8)?

Mathematics

1 answer:

MA_775_DIABLO [31]2 years ago

5 0

-7(-8) = 56 [multiplication of two negative numbers gives a positive number]

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15 points!!! HELP. 4 Graph x - 2y > 8

qwelly [4]

Answer:

4). $y$ (look at my explanation for how to graph)

5.) $y$ (look at my explanation for how to get the correct numbers)

6.) $x\geq 2$ (look at my explanation for how to graph)

Step-by-step explanation:

Question 4:

Solving for y:

First it's better if you solve for y then graph, it's easier that way.

$x-2y>8\\-2y>-x+8\\y$

As you might notice the greater than sign flipped, that doesn't always happen. It only happens when you are dividing by a negative number.

Graphing the inequality:

When you start graphing you should always start by plotting the y-intercept. Which in this case it's $(0,-4)$ . Then starting from that point you would go up 1 unit then right 2 units then plot the new point because the slope is $\frac{1}{2}$ . The 1 would be the up and down as for the 2 it will be the right and left. This goes up 1 and right 2 because it's positive. So you keep going creating new points as you go then when you reached the end of the graph you would go back to $(0,-4)$ and do the opposite so you will do down 1 then left 2. When you run out of room you will have to draw a line, but be careful the line has to be dotted because the solid lines are used for the greater/less than or equal to signs. Then make sure to add arrows at each side of the dotted line to indicate that this line is infinite.

Question 5:

I'm very sorry but I can't see the picture since it's a bit blurry. So I'll try to explain how to write the inequality the best I can. So first we need to know the y-intercept it should be the point directly on the y-axis. Then find the slope by seeing how it gets to the next perfect point. I can tell you that the slope will be positive. Also for the sign it's dotted that means the sign is . So the inequality should look something like this $y$ . Make sure you have the signs correct too don't change the ones I already put in.

Question 6:

For this one the inequality will look like this $x\geq 2$ . Then for the graph you will plot $(2,0)$ . Then make a solid line that goes vertically since the only x-value is 3 the y-value will be changing without the x. Then for the shading you will shade the right side of the line.