What is the substitution of #y=-8 and y=-2x-12#?

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Answer 1 · 2018-02-27T21:52:50

Setting the equations equal to each other, we find #x=-2.#

and #y# is given as #y=-8#

Each equation has the subject as #'y'#, so we can say:

#y = y#

#:.-8=y=-2x-12#

This is the same as:

#-8=-2x-12#

Next, we solve for #x:#

#12-8=-2x-12+12#

#4=-2x#

#4/-2=(-2x)/-2#

#-2=x#