Question 934633

{{{4x + 2y = 34}}}...eq.1..both sides multiply by {{{2}}}
{{{10x- 4y = -5}}}....eq.2
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{{{8x + 4y = 68}}}...eq.1
{{{10x- 4y = -5}}}....eq.2
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{{{8x + 4y +10x- 4y= 68-5}}}....eliminate {{{y}}}

{{{8x + cross(4y) +10x- cross(4y)= 63}}}

{{{18x= 63}}}

{{{x= 63/18}}}

{{{x=3.5}}}

go to {{{10x- 4y = -5}}}....eq.2, plug in {{{x}}} value

{{{10*3.5- 4y = -5}}}

{{{35- 4y = -5}}}

{{{35+5 =4y}}}

{{{40 =4y}}}

{{{y=10}}}