Assume that A varies directly with z. If A = 30 when z = 5, find A when z = 9.
2 answers:
We can this two ways:
1) If A = 30 when Z = 5, then A = 6Z or A = 6*z
So if Z = 9, 9 * 6 = 54. A = 54.
2) You can set up a proportion:
where x = the unknown A-value.
Crossmultiply:
5x = 30*9
5x = 270
Divide by 5 on both sides to isolate the variable
x = 54
54 is your A value when Z = 9.
Either way you solve it, your answer is 54.
1) If A = 30 when Z = 5, then A = 6Z or A = 6*z
So if Z = 9, 9 * 6 = 54. A = 54.
2) You can set up a proportion:
Crossmultiply:
5x = 30*9
5x = 270
Divide by 5 on both sides to isolate the variable
x = 54
54 is your A value when Z = 9.
Either way you solve it, your answer is 54.
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