Math

Which graph best represents the solution to the following pair of equations? (1 point)

y = −x − 5
y = 2x + 4


A graph is plotted with values ranging from negative 10 to 10 on both x axis and y axis at increments of 1. Two lines having equations y is equal to negative x minus 5 and y is equal to 2 times x plus 4 are plotted. These 2 lines intersect at the ordered pair 6, 7.
(6,7)

A graph is plotted with values ranging from negative 10 to 10 on both x axis and y axis at increments of 1. Two lines having equations y is equal to negative x minus 5 and y is equal to 2 times x plus 4 are plotted. These 2 lines intersect at the ordered pair 6, negative 8.
(6,-8)

A graph is plotted with values ranging from negative 10 to 10 on both x axis and y axis at increments of 1. Two lines having equations y is equal to negative x minus 5 and y is equal to 2 times x plus 4 are plotted. These 2 lines intersect at the ordered pair negative 3, negative 2.
(-3,-2)

A graph is plotted with values ranging from negative 10 to 10 on both x axis and y axis at increments of 1. Two lines having equations y is equal to negative x minus 5 and y is equal to 2 times x plus 4 are plotted. These 2 lines intersect at the ordered pair negative 6, 7.
(-6,7)


OK, so on this problem, i got the answer (-3,-2) which is C, but when you go back and check your work, any way you work it out, the equations dont agree. Can someone please explain why this is.

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  1. since y = both, just equate them:
    -x-5 = 2x+4
    3x = -9
    x = -3
    y = -2
    Too bad you didn't show your work...

  2. oobleck, yes I do realize that. Did you read it because I said I got that answer but when you went to check it, nothing equaled anything. I got the answer but checking the work did not support it.

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  3. Sorry if this sounded rude. Not being rude at all! :)

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  4. C:
    A graph is plotted with values ranging from negative 10 to 10 on both x axis and y axis at increments of 1. Two lines having equations y is equal to negative x minus 5 and y is equal to 2 times x plus 4 are plotted. These 2 lines intersect at the ordered pair negative 3, negative 2.
    (-3,-2)

    so, what do you mean "nothing equaled anything"?
    Plot the two lines. They intersect at (-3,-2)?
    I didn't read your gibberish, because the description of the solution "equaled" perfect sense to me.

    sheesh.

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