algebratrig help ASAP
posted by missy on .
Can someone please help me understand how to graph y=3cos(x/4)5

draw your standard cos(x) function, with tics at standard places: 0,pi/6,pi/4,pi/3,pi/2,pi, etc.
Now, you want x/4 to be those values, instead of x. So, multiply all the xvalues by 4: change the labels to
0,2pi/3,pi,4pi/3, ...
Now you have a graph of cos(x/4)
Relabel the yaxis to go from 3 to 3 instead of 1 to 1.
Now you have a graph of 3cos(x/4)
Now Relabel the yaxis by subtracting 5 from what it shows, so it now runs from 8 to 2
Draw a new xaxis at the new y=0, and you have a graph of 3cos(x/4)5