Y varies inversely as x, and y = 50 when x = 10. What is the value of y when x = 20? |
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Method 1: In an inverse variation as one variable increases the other decreases. #color(blue)(yprop1/x# We now insert a constant #k# into the equation: #y = k * 1/x# #color(blue)(y = k /x# We now substitute the value of variables as provided: #x=10 , y =50# #50 = k /10# #k = 50 * 10 = color(green)(500# Now we use the value of this constant to find #y:# As per data provided #x =20# #color(blue)(y = k /x# #y = 500 /20# #color(purple)(y = 25# Method 2: As per data provided when #color(green)(x =10)# , #y =50# So, when #x =20#, the value is doubled from the initial value of #x#, (#20 = color(green)(10) * 2)# Since the value of #x# is doubled , the value of #y# will have to be halved from the initial value, since there is an inverse variation. So, #y = 50/2, color(purple)(y = 25# |
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