Question

x + y = 4
x - 2y = -5

If the first equation is multiplied by 2 and then the equations are added, the result is _____.

Answer 1

3x=-1

Answer 2

how did you get that?

Answer 3

wait pellet i did it wrong

Answer 4

2x + 2y = 8
x - 2y = -5
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3x=3

Answer 5

multiply each term in the first equation by 2

Answer 6

then you add the equations - note the Y will be eliminated because they will zero out

Answer 7

once you solve for X...
plug the value of X into one of the original equations to determine the value of Y