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05-02-2017
Mathematics

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Solving a linear equation using the substitution method.

2y-x=3
y-x=4

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05-02-2017

solve for 1 variable
solve for y in 2nd
y-x=4
add x
y=4+x
su that for y in other

2(4+x)-x=3
8+2x-x=3
8+x=3
minus 8
x=-5
sub back
y=x+4
y=-5+4
y=-1

(x,y)
(-5,-1)

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