Joanna is carrying her books to school in her backpack. Her library book weighs \dfrac{3}{8} 8 3 ​ start fraction, 3, divided by, 8, end fraction of a kilogram, her science book weighs \dfrac{11}{8} 8 11 ​ start fraction, 11, divided by, 8, end fraction kilograms, and her math book weighs \dfrac{5}{8} 8 5 ​ start fraction, 5, divided by, 8, end fraction kilograms.

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.

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step-by-step explanation:

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step-by-step explanation: