900 cm/h = cm/min plz helpppp
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The y intercept is the point where the line passes through on the y-axis.for example on the graph that I showed we can see how the line passes through the 1 on the y-axis. This means 1 is our y-intercept. If you are still confused let me know lol
If the question is supposed to be 
Now multiply both sides by 3 to get 3(-21)=-63=e
Now multiply both sides by 3 to get 3(-21)=-63=e