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The answer is y=-4x+21

Well, you can do this by first putting the numbers into point-slope form. That will be y-21=-4(x-0)

Then, you can simplify by doing the distributive property.

Lastly, add 21 on both sides to get the slope-intercept form.
y-21=-4x+0
+21 +21

y=-4x+21

Hope this helps!✨❤️

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.