The supermarket has 30 aisles. 30% are empty, without any shoppers. How many empty aisles are there in the supermarket?

9 empty aisles

Step-by-step explanation:

in 100 aisles there are =30 empty

in 1 aisles there are =30/100 empty

in 30 aisles there are =30*30/100 empty

=9 empty aisles

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step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.