Algebra 10

# Algebra 10 - x =-9 – y Substitute for x in equation 1...

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1.) Solve the system by substitution x+y=12 y=12 Since Y = 12, we can substitute for y in the first equation as follows: X + 12 = 12 (Subtract 12 from each side) X = 0 X = 0, and y = 12 (0,12) 2.) Solve the system by substitution 3x-y =-7 (Equation 1) x+y=-9 (Equation 2) From Equation 2: x + y = -9 (Subtract y from each side)

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Unformatted text preview: x = -9 – y Substitute for x in equation 1 3(-9-y) – y = -7-27 -3y – y = -7-27 -4y = -7 (Add 27 to each side)-4y = 20 (Divide each side by -4) y = -5 Substitute for y in equation 2 X + (-5) = -9 X – 5 = -9 (Add 5 to each side) X = -4 Therefore, x = -4, and y = -5 (-4,-5)...
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## This note was uploaded on 02/27/2008 for the course MATH 116 taught by Professor Philip during the Spring '08 term at A.T. Still University.

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Algebra 10 - x =-9 – y Substitute for x in equation 1...

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