Solve using substitution technique; -3x+y=2, 12x-4y=-8
1 answer:
The first equation is easier to solve for y than is the 2nd: y = 3x+2. Subst. 3x+2 for y in the second equation:
12x - 4(3x+2) = -8
Expanding, 12x =12x -8 = -8
This is always true, no matter the value of x. Thus, the solution set is "all real numbers."
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