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Posted by on Friday, October 5, 2007 at 3:39pm.

1. What is the first step for solving this system by substitution? 3x-2y=8
x+7y=10

2. How many solutions does this system of equations have? 3y-6x=12
y-2x=4

  • Algebra 2 - , Friday, October 5, 2007 at 5:43pm

    #1
    I would isolate the x in the second equation,
    that is, x = 10-7y
    then substitute into the first equation.

    #2
    an infinite number of solutions, since the first equation is simply 3 times the second.

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