Which systems of equations are best solved using addition?
1 answer:
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Let's represent birds by the letter x and cats by the letter y. Since birds have 2 legs, and cats have 4, we can express this as:
We can solve by substitution. Let's solve for x in the second equation:
Replace every x in the first equation by that:
Now, plug that in for y in second equation and solve for x:
Since x was the number of birds and y was the number of cats in the store, there are 35 birds and 17 cats in the store.
We can solve by substitution. Let's solve for x in the second equation:
Replace every x in the first equation by that:
Now, plug that in for y in second equation and solve for x:
Since x was the number of birds and y was the number of cats in the store, there are 35 birds and 17 cats in the store.