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Solve: 8x-4y=-4 4y=3x+14 Student Work: 8x-4y=-4 4y 3x+14+(-3x+4y=D14) 5x 10 5 5 x=2 &r-4y=-4 -3x-3x 8(2)-4y=-4 16-4y=-4, -16 -16 4y=-20 4 4 y=-5 (2,-5) What mistake did this student make? O They did not change the 2nd equation to standard form O When combining the two equations 8x-3x should be -11x O y = 5 not -5 O x = -2 not 2

Solve: 8x-4y=-4 4y=3x+14 Student Work: 8x-4y=-4 4y 3x+14+(-3x+4y=D14) 5x 10 5 5 x=2 &r-4y=-4 -3x-3x 8(2)-4y=-4 16-4y=-4, -16 -16 4y=-20 4 4 y=-5 (2,-5) What mistake did this student make? O They did not change the 2nd equation to standard form O When combining the two equations 8x-3x should be -11x O y = 5 not -5 O x = -2 not 2

Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.4: The Addition-or-subtraction Method
Problem 21WE
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Solve: 8x-4y=-4 4y=3x+14 Student Work: &x-4y=-4 8x-4y=-4 4y=3r+14+(-3x+4y3D14) 5x 10 5 5 x=2 -3x-3x 8(2)-4y=-4 16-4y=-4. -16 -16 4y=-20 4 4 ソ=-5 (2,-5) What mistake did this student make? They did not change the 2nd equation to standard form When combining the two equations 8x-3x should be -11x Oy 5 not -5 Ox= -2 not 2
Transcribed Image Text:Solve: 8x-4y=-4 4y=3x+14 Student Work: &x-4y=-4 8x-4y=-4 4y=3r+14+(-3x+4y3D14) 5x 10 5 5 x=2 -3x-3x 8(2)-4y=-4 16-4y=-4. -16 -16 4y=-20 4 4 ソ=-5 (2,-5) What mistake did this student make? They did not change the 2nd equation to standard form When combining the two equations 8x-3x should be -11x Oy 5 not -5 Ox= -2 not 2
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