rasheed is buying wings and quesadillas for a party. A package of wings costs $8. A package of quesadillas costs $10. He must sp
end no more than $160. Rasheed's freezer will hold a maximum of 20 packages of wings and quesadillas. PART B: Graph the systems of linear inequalities and shade where the solutions are.
2 answers:
Answer:
Step-by-step explanation:
A system of inequalities of two variables is a set of inequalities of two variables that act at the same time, that is, the solution points must meet all the inequalities of the system.
Then you must first define what the system variables will be. You know that Rasheed is buying wings and quesadillas for a party. Then your variables will be:
- w: number of package of wings bought by Rasheed.
- q: quantity of package of quesadillas bought by Rasheed.
You know too that a package of wings costs $8 and a package of quesadillas costs $10. Then $ 8*w and $ 10*q will be the price paid for the amount of packages bought from wings and quesadillas by Rasheed respectively. If he must spend no more than $160 between winds and quesadilla, so:
<u><em>8*w + 10*q ≤ 160</em></u>
On the other hand, Rasheed's freezer will hold a maximum of 20 packages of wings and quesadillas. So the quantity of packages of wings and quesadillas bought by Rasheed should not exceed the quantity of 20.
Therefore, <u><em>w + q ≤ 20</em></u>
Finally, the system of linear inequalities is:
<em></em>
To find the solution of the system, look for the solutions of each of the inequalities of the system and look at the regions where they will coincide.
That is, a possible method of finding common regions among all inequalities is to first find each region of each inequality. Then all the solutions are drawn on the same plane. The regions thus overlap, being able to easily see which regions will be a system solution.
In the attached image you can see the graph of both inequations. One region is marked green, belonging to the inequality w + q ≤ 20, while the other region is marked violet, belonging to the inequality 8*w + 10*q ≤ 160.
The areas where it is shaded by both colors, this is the intersection of the regions solutions, will be the solutions of the inequality system.
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Answer:
See the attached image for the graph of the first system.
Step-by-step explanation:
Here's how to graph the first system.
Start with the inequality . You can make this easier to work with by multiplying through by -1. Remember to switch the inequality sign when multiplying by a <u>negative</u> number. OK, you get the inequality
.
The graph will be a half-plane -- all the points on one side of a line. The line that is the boundary of the half-plane has an equation: -- just use an = sign instead of the inequality sign.
Graph the line.
The equation of the line is in slope-intercept form: y = mx + b, so you can tell the y-intercept is 3 and the slope is 2 (think of it as a fraction 2/1). Graph the line by going to the point (0, 3) -- the y-intercept -- then use the slope 2/1 interpreted as "rise over run" to go up 2 units and right 1 unit, arriving at the point (1, 5). Draw the line through those points, (0, 3) and (1, 5).
Now you have to decide which side of the line the inequality is describing. To do this, pick a point which is not on the line, plug its coordinates into the inequality; if the result is true, shade the side of the line the point you picked is on (if false, shade the <u>other</u> side!)
An easy point to pick in this case is the origin, (0, 0). Put zeros in for x and y in the inequality, and you'll get the statement . That's <u>false</u>, so shade the side of the line <u>not</u> containing the origin. In the image below, the shading is in purple.
All right, now for the other inequality, . Subtract 2 from both sides and the inequality becomes
. This, too, graphs as a half-plane whose boundary line has equation
. Graph the line. A line with an equation that has x in it but not y is a vertical line with all its x-coordinates equal to the number on the right side of the equation. This line is vertical and goes through points such as (-2, 0).
Pick a point <u>not</u> on the line (the origin works again). Put the coordinates into the inequality to get which is <u>false</u>. Shade the side of the vertical line which does <u>not</u> contain the origin. In the image below, the shading is in black.
Finally, YAY! \o/ , the solutions to the system are all the points in the plane that got shaded twice. In the image, they are the cross-hatched points above the purple line and to left of the black line.
Note: If you get a system with three inequalities, you'll be graphing three half-planes and looking for points that got shaded three times!
Note: One of your questions has the inequalities and
in it. These two inequalities say that the x and y coordinates are both positive or zero, confining your attention to Quadrant I in the upper-right part of a graph, above the x-axis <u>and</u> to the right of the y-axis.
