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Which is the correct step in the following system of equations when solved by substitution?

x + 3y = 7

2x - 4y = -6

a. 2 ( - 3y - 7) - 4y = - 6
b. 2 ( 3y - 7) - 4y = -6
c. 2 ( - 3y + 7) - 4y = -6
d. 2 ( 3y + 7) - 4y = - 6

1 answer

from
x + 3y = 7
x = -3y + 7

sub into
2x - 4y = -6
2(-3y + 7) - 4y = -6

mmmhhhh?

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