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MathematicsMathematics
3 March, 06:39

Using substitution or elimination

9x+3y=-7

y=-3x+4

+2
Answers (2)
  1. 3 March, 08:09
    0
    No solution

    Step-by-step explanation:

    Plug in y=-3x+4 into 9x+3y=-7

    9x+3 (-3x+4) = -7 Distribute the 3

    9x - 9x + 12 = -7 Combine like terms

    12 = -7 This statement isn't true. Therefore this is system of has no solution. The lines do not intersect.
  2. 3 March, 10:08
    0
    No solution

    Step-by-step explanation:

    If we substitute the y into the equation, we get 9x+3 (-3x+4) = -7

    If we distribute the 3, we get 9x-9x+12=-7

    This then cancels out both 9x's and we are left with 12=-7, making it no solution.
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