SOLUTION: Solve this system of equations by the substitution method 7x - 4y = 13 (1) x=3 (2)

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Question 410118: Solve this system of equations by the substitution method
7x - 4y = 13 (1)
x=3 (2)
Answer by Coyote 10(7) About Me  (Show Source):
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Simply substitue 3 in for x so ypur equation would look like 21-4y=13. Subtract 21 to one side so your equation to get -4y=-8. divide by four so y=2. thus (x,y)= (3,2)