X + 1/3y = -11 and 3x/4 - y/2 = -15 What are x and y? How do I solve for x and y?
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Anonymous
ANSWERS: 3
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Solve for a relation between X and Y in one of the equations, and then substitute that value back into the other equation. When you get answers for X and Y, double check with both equations. For example, if you had two equations like x + 5 = 2y +3 and x-7 = 3y/8, you could simplify the first equation to x = 2y - 2. Then you would substitue (2y - 2) for x whereever it appeared in the second equation, and you could then get a value for Y.
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Turn to the chapter called "Simultaneous Equations" in your text book. Or, alternatively, rearrange them to form a linear function, and turn to the chapter that describes "how to find the Intersection of Two Lines." Or simply follow Wide Awake Phoenix's answer.
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(x+1/3y=-11) Take whole equation and multiply by 3 (3x+y=-33) Then solve for y by subtract x from both sides (y=-33-3x) Then take the other equation and substitute the y in the equation with the -33-3x (3x/4-(-33-3x)/2=-15) Then solve for x (3/2x+3/4x+16.5=-15) (9/4x=-31.5) (x=-14) Then solve for Y (3(-14+y=-33)) (y=9) Kinda messy but seems like the right answer. Then you write the equation into an ordered pair: (-14,9) The X and y are the coordinates on a plain. These two equations would show a point that is 14 to the left and 9 up
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