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solving systems of equations by substitution how do you do it

Algebra
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-3x + 2y = -5   3x = 21

Jan 29th, 2015

-3x+2y=-5..........equation 1

3x=21........equation 2

solving the value of x in equation 2

x=21

substituting the value of x in equation 1

-3(21)+2y=-5

-63+2y=-5

2y=-5+63

2y=58

y=29


Jan 29th, 2015

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