15 of the students in a Chemistry class passed a Chemistry test. If these students are 75% of all the students in the class, how many
students are in this Chemistry class?

20

Step-by-step explanation:

Hope this helps

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step-by-step explanation:

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.