Find slope of given line:

2y + 4x = 4.5

2y = -4x + 4.5

y = -2x + 2.25

slope is -2, parallel lines have same slopes

Get equation of line through (2,2) with a slope of -2

y = mx + b

2 = -2(2) + b

2 = -4 + b

b = 6

slope is -2 and y-intercept is 6

y = -2x + 6

*McGenius*

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