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Helga [31]
3 years ago
11

I don't understand how to do this

Mathematics
1 answer:
UkoKoshka [18]3 years ago
3 0
Hi!
The table above is showing how to plug in a variable to x. For an example,
5x - 3 =?
when x= 4 would equal 17. How we would get this is substitute x with 4 and use our order of operations.
5(4) - 3 = 20 - 3 =  17
To get 68, we would do this in reverse. We would add 3 to both sides to eliminate the -3 to have a remainder of
5x  =  71
Divide both sides by five to solve for x.
x = \frac{71}{5}
We can also check our math and plug in 17/5 into x
5( \frac{71}{5} ) - 3 =71 - 3 = 68

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