Mathematics
Danae734
37

Solve by substitution or elimination; x+2y=-1 x-y=5

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(2) Answers
Cayla932

I would love to use substitution (It is simplier that way I guess) solve your system of equations. x+2y=−1;x−y=5 Solve x+2y=−1 for x: x+2y+−2y=−1+−2y(Add -2y to both sides) x=−2y−1 Substitute (−2y−1) for x in x−y=5: x−y=5 −2y−1−y=5 −3y−1=5(Simplify both sides of the equation) −3y−1+1=5+1(Add 1 to both sides) −3y=6 −3y/−3 = 6/−3(Divide both sides by -3) y=−2 Substitute (−2) for y in x=−2y−1: x=−2y−1 x=(−2)(−2)−1 x=3(Simplify both sides of the equation) So the answer is (x = 3 and y = -2)

michaliosmulio

i used substitution x-y=5 x-y=5 +y +y x= y+5 x+2y=-1 y+5+2y=-1 3y+5=-1 -5 -5 3y=-6 ÷3 ÷3 y=-2 x-(-2)=5 x+2=5 -2 -2 x=3 x=3 y=-2

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