y=2x and 3x+2y=21 solve by substitution method

solve the linear equation using the substitution method

y=2x

3x+2y=21
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2 Answers

line 1: 3x+2y=21

line 2: y=2x

3x+2*(2x)=21

3x+4x=21

7x=21

x=3

y=6
by
2x = -3y-11 and 2y = 6x - 22
by

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