How to multiple 90km/h x 1h 30min
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Hello!
If y varies jointly with x and z, it'll mean that x and z are being multiplied by a factor "k", to equal y.
To give you a visual, this is what I mean.
That means we'll want to find with the first point we're given:
Which means our equation is:
Now, let's plug in the and
from the other point to find
.
Hope this helps!