The slope intercept form is:

y = mx + b

"m" is the slope, "b" is the y-intercept (the y value when x = 0)

Since you know the slope is -2, you can plug it into "m"

y = mx + b

y = -2x + b

To find "b", you can plug in the point (-3, 10) into the equation

y = -2x + b

10 = -2(-3) + b

10 = 6 + b Subtract 6 on both sides

4 = b

y = -2x + 4

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