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y - 3 = 3(x + 1)
Distribute on the right to remove the parentheses:
y - 3 = 3x + 3
Get y alone on the left side by adding +3 to both sides
y - 3 = 3x + 3
+ 3 + 3
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y = 3x + 6
Answer: y = 3x + 6. The slope is 3 and the y-intercept is (0,6)
Edwin