So basically get the y on the left hand side and the x's and other constants on the other side.
The slope will be the number in front of x so
2x+y=1 ----> y=-2x+1 which has a slope of -2
x+y=1 ------> y=-x+1 which has a slope of -1
4x-y=9 ----> -y=-4x+9 but we need to multiple each side by a neg sign because y is neg. so it changes to y=4x-9 and the slope is 4
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