A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
need a refresher
solve the equations by graphing
3x+y=15
4x+5y=9
anonymous
 5 years ago
need a refresher solve the equations by graphing 3x+y=15 4x+5y=9

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0To solve by graphing means graph each equation and see where they intersect.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Do you know how to graph these?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0multiply first by 4 and second by 3 and subtract to eliminate x

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0or multiply first by 5 and subtract from 2 to eliminate y

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ahhhhh......we r graphing.....damn

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0give two values to x and y in the first equation to draw the line for first equation

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0same with the second one.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and check where it intersects !!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so lets say (4,3) for the first equation

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The easiest way to graph a line is to find the intercepts by plugging in 0 for x, and solve for y, then plug in 0 for y and solve for x. That will give you two points \((0,y_0)\) and \((x_0,0)\). Then you just draw the line that connects them and that is the graph of the equation.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.03x+y=15 if x=0 then y=15

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0someone please help me solve this step by step 3x+y=15 4x+5y=9

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Refer to the attached plot, \[\text{Plot}\left[\left\{153x,\frac{9}{5}\frac{4 x}{5}\right\},\{x,1,8\}\right] \] The plot program requires that the two equations be solved for y. It then computes all of the points displayed. For each value of x between 1 and 8 it then computes the corresponding value for y. This plot program was running under an Apple 64 bit OS and the results are instantaneous. The fact is that a line is relatively simple to plot for a human because two points determine a line. If you know where the line crosses the x axis and where it crosses the y axis, then all you have to do is mark the two points on graph paper and draw a line through them with a ruler. The math lingo for these points is the x intercept and y intercept respectively. The process has been described fairly well by polpak's second posting. The expressions in the plot statement are the result of solving for y. If y is zero, in the first expression, then the corresponding x has to be 5 ie: (5,0) If you refer to the plot you will see the blue line crossing the x axis at (5,0). The blue line appears to cross the y axis at 15 or through the point (0,15). That is easy to confirm because when x is zero, 15  3x = 15. For the red line, the y intercept is easy to compute because when x = 0, 9/5  4/5 times x = 9/5 = 1.8 The solution to the problem is the point coordinates where they cross each other. In this case by eye ball, x=6 for sure and y is close to 3.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.