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18 November, 00:41

Y=3x+7 solve this system of equation using any method

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  1. 18 November, 03:17
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    x=2, y=13

    Step-by-step explanation:

    In order to get this by addition which is the easiest way for this you want to take both equations

    y=3x+7 and y=-4x+21 and move x to the other side of the equation so it is like 4x+y=21 and - 3x+y=7 like that now you have to get rid of one of the exponents and the easiest one to get rid of is y so I'm going to multiply - 3x+y=7 by negative 1 so it becomes 3x-y=-7 that way the equations value has not changed since I multiplied both sides and now when I add

    4x+y=21 and 3x-y=-7 It'll look like

    4x+y=21

    3x-y=-7 add those It will get rid of the y

    then get 7x=14 simplify to get x=2 then you can take - 3x+y=7 plug in x and get

    -3 (2) + y=7 multiply into - 6+y=7 then simplify you get y=13
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