Algebra
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1. y = 2x + 3 and y = -x - 4
2. 2y + 3x = 7 and 8y + 12x = 28
3. 5x + 6y = 1 and x + 7y = 2
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(1) Since the coefficients of y in the two equations are the same, we directly subtract the second equation from the first.
This gives y - y = 2x + 3 - (-x - 4)
0 = 2x + 3 + x + 4
0 = 3x + 7
3x = -7
x = -7/3
Plug this value in in the ...
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