Need help to know what to do:
solve the equation
9/(x=7)=4/(x-3)
My book tells me to cross multiply, then move all the terms in x and the terms without x on separate sides of the equation. then divide by the coefficient of x. How do i do this?
I don't understnd it what that means.
Cross multiple means:
nominator of left side x denominator of right side = nominator of right side x denominator of left side
So for this case:
9 * (x-3) = 4 * (x-7)
9x - 27 = 4x - 28
Now, let's collect the variable x on the left side, and the rest on the right side.
9x - 4x = 27 - 28
5x = -1
To find the final result, divide the right side with the coefficient of x.
x = -1/5