For the following system, if you isolated x in the first equation to use the substitution method, what expression would you substitute into the second equation? -x - 2y = -4 3x + y = 12
a. -2y - 4
b. 2y - 4
c. 2y + 4
d. -2y + 4

The expression you would substitute for x is -2y+4. The answer is d.

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for

Idon’t know what the answer is i wish i could