Question

x+2y+1=0,2x-3y=12 solve equation

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Answer 1

Step-by-step explanation:

Solvex+2y+1=0for x:

x+2y+1=0

x+2y+1+−2y=0+−2y(Add -2y to both sides)

x+1=−2y

x+1+−1=−2y+−1(Add -1 to both sides)

x=−2y−1

Step: Substitute−2y−1forxin2x−3y=12:

2x−3y=12

2(−2y−1)−3y=12

−7y−2=12(Simplify both sides of the equation)

−7y−2+2=12+2(Add 2 to both sides)

−7y=14

−7y

−7

=

14

−7

(Divide both sides by -7)

y=−2

Answer 2

Answer:

x+2y=-1

2x-3y=12

then, multiple eq'n 1 by 3

3x+6y=-3

then, multiple eq'n 2 by 2

4x-6y=24

3x+6y=-3

4x-6y=24

7x=21

x=3

put x=3 in eq'n 1

3+2y=-1

2y=2

y=1

Step-by-step explanation:

x=3,y=1.