U subtitution for Arc Tan(x)/ x^2 +1 dx

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1. solve by the subtitution method.2x+3y=8 -6x+y=36 I came up with (-2,-6) am I close
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2. i don't get these please help me:use the subtitution method to solve the linear system 1)3x+y=0 x-y=4 2)y=-3x-1 x-3y=3 3)3x-y=9
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3. can you show me how to maniplate this using Trig subtitution...integral dx/4+x^2 x is bounded on [-2, 2]
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4. using subtitution which number from the set [6,12,13,26] makes this equation 3x-10 equals 26 true
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