Michael is training for a marathon. In his first week he plans to run 8 miles. Which path should he take?
2 answers:
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Answer:
x=1, y=3
Step-by-step explanation:
21x + 7y = 42
Divide this by 7
3x +y = 6
-5x +5y = 10
Divide this by 5
-x+y = 2
Subtract the two equations to eliminate y
3x +y = 6
-(-x+y = 2)
------------------------
3x +y = 6
+x-y = -2
------------------------
4x = 4
Divide by 4
x = 1
Now solve for y
-x+y = 2
-1 +y = 2
Add 1 to each side
y = 2+1
y =3
