Show that the lines y=3x+7 and 2y–6x=8 are parallel. Do not use a graphical method.
y=3x+7 2y-6x=8
2y-6x=82y=8+6xy= 4+3xy=3x+4When both equations equal y they both have a 3 in front of their x meaning that they both have a gradient of 3.
JM
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