This can be explained with the equation y=2x+10 (I chose 2 arbritrary variables, any are acceptable). A week is equivalent to 7 days so x=10. Plug this into the equation and you end up with 24, because 2(7)+10=24
3rd one Reason: Point slope formula: y-y1=m(x-x1) y1=-4 x1=1 m=1/2 Put it all together and you get a final answer of: y-(-4)=1/2(x-1) two negatives make one positive so, final answer:y+4=1/2(x-1)
