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Solve this using substitution?????????????

0 votes
7x = 2y + 1
4y = -3x + 15
asked Mar 4, 2013 in ALGEBRA 2 by dkinz Apprentice

1 Answer

+1 vote

7x = 2y + 1
multiply the equation by 2
14x = 4y + 2
replace 4y = -3x + 15 in the above equation
14x = -3x + 15 +2
add 3x to each side
14x+ 3x = -3x + 17 +3x
17x = 17
divide each side by 17
x = 1
substitute x = 1 in 4y = -3x + 15
4y = -3 * 1 + 15
4y = 12
divide each side by 4
y = 3
(x, y) = (1, 3)

answered Mar 5, 2013 by casacop Expert

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