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Which are true when solving this system by substitution? y = 2x + 2 4x + 7y = 32
a. The solution is (1,4). b. The variable x is the one to be isolated. c. 4(2x + 2) + 7(2x + 2) = 32 is the correct substitution. d. The first equation is already solved for y.
Sagot :
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