Answer:
When you have a equation such as
y = 2x + 4
This means, that whatever x equals, do the rest equation for y. They give you a table, the numbers under x, you replace x with the x in the equation. Multiply it next to the number. Do the rest of the equation, that is how you get y.
Once you do all x numbers, you have to graph it.
X = run
Y = rise
X is the horizontal line
Y is the vertical line
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Look at the middle, the x numbers that are to the right of the vertical line are negative.
The ones to the left are positive.
The numbers that are on the top of y are positive
The numbers that are on the bottom are negative.
Hope this helps!