math

For questions 5–7, find the solution to the system of equations by using either graphing or substitution

5. y = 6 – x and y = x – 2 (1 point)
(2, 4)***
(–4, 2)
(4, 2)
no solutions
6. y = 2x – 1 and y = x + 3 (1 point)
(4, 7)
(7, 4)
(–7, –4)***
infinite solutions
7. y = 4x and y + x = 5 (1 point)
(–4, 1)
(1, 4) ***
(–3, 2)
(2, 3)

am i right?

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  1. All I did was to sub in your choice into each of the equations.
    #7 is correct, the other two are not

    #5
    since both say y = ...
    we can substitute:
    x-2 = 6-x
    2x = 8
    x = 4
    back in the first:
    y = 6-4 = 2 , so (4,2)

    #6 , same way ...
    2x-1 = x+3
    x = 4
    then y = 8-1 = 7
    solution: (4,7)

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  2. thx

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  3. c
    a
    b
    d
    solving systems of equations by graphing

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