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3x-y=7 find y when x is 7

3x−y=7 3 x-y=7 find y y when x x is 77

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Full solution

Q. 3x−y=7 3 x-y=7 find y y when x x is 77
  1. Substitute x=7x = 7: We are given the equation 3x−y=73x - y = 7 and we need to find the value of yy when xx is 77. First, we substitute x=7x = 7 into the equation. 3(7)−y=73(7) - y = 7
  2. Perform multiplication: Now we perform the multiplication 33 times 77. \newline21−y=721 - y = 7
  3. Isolate and solve for y: Next, we isolate y by adding yy to both sides of the equation and subtracting 77 from both sides.\newline21−y+y=7+y21 - y + y = 7 + y\newline21−7=y21 - 7 = y
  4. Perform subtraction: We then perform the subtraction to find the value of yy.y=21−7y = 21 - 7y=14y = 14

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