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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!✨❤️

The answer would be 13.5 minutes.

To find the x-intercept, make  y  equal to zero, and solve for  x. to find the y-intercept, make  x  equal to zero, and solve for  y.explanation: y=4x−2x-intercept0=4x−2add  2  to both sides of the equation.2=4xdivide both sides by  4.24=xsimplify.12=xswitch sides.x=12y-intercepty=4(0)−2y=−2