Question

Can anyone help me with this graph problem?

I have to use either the elimination or substitution to find the solutions (if any).
And I have to graph the two lines, and list the x-intercepts, y-intercepts, and points of intersection.

Here is the first one..........

3x + 7y = 3 and 12x + 28y = 16

Answer 1

Okay, so first, solve both equations for y:

y = (3 - 3x)/7
y = (16 - 12x)/28

Next, set y = y:
(3 - 3x)/7 =(16 - 12x)/28

Next, solve for x by cross multiplying and grouping methods:
28(3-3x) = 7(16-12x)

84 - 84x = 112 - 84x

Hmmm, I get no solution at this step...

Answer 2

There is no solution, therefore, there is no need to do anything further

Answer 3

ok, how would you show that on a graph and how do I determine the x-intercept, y-intercept and slope?

Answer 4

Q: How do you show that on a graph?
A: Graph the following:
y = (3 - 3x)/7
y = (16 - 12x)/28

Q: How do you determine the x-intercept?
A: To determine the x-intercept, set y = 0, then solve for x

Q: How do you determine the y-intercept?
A: Set x = 0, solve for y

Q: How do you find the slope?
A: Observe The following Equations:

y = (3 - 3x)/7
y = (16 - 12x)/28

Notice that the slope for the first one is 3x/7
Notice that the slope for the second one is 12x/28 or 3x/7

So the slope for both is 3x/7

Answer 5

If an equation has the same slope, the graph of both are parallel, thus no intersection, and thus no solution

Answer 6

Thank you for trying Bliss, but I have no idea what I am doing on this

Answer 7

I'm sorry to hear that....

Answer 8

The only thing I could try is post an online classroom with voice and explain it to you. Are you interested?