First set up the equation to find answer: y=7-x. Then add it to the variable. 3x-1(7-x)=1. So that makes it 3x+-7+-1=1. Add like terms -7+-1=-8, so 3x+-8=1. Now to find x just switch the 8 to the other side. So you end up with 3x=9 since when you take away a number from one side you need to use the opposite value so adding 8 to -8 will cancel it out, then add it to the other, then just divide. 9/3=3, from here just substitute to find y. y=7+3. y=10. The answer is x=2 and y=5. I hope I helped!
3x - y = 1 -3x -3x -y = -3x + 1 __ ______ -1 -1 y = 3x -1 (then you plug it into the other equation) x + 3x -1 = 7 4x -1 = 7 +1 +1 4x = 8 __ ___ 4 4 x = 2 (then you go back and plug in x in the other equation we made earlier) y = 3(2) -1 y = 6-1 y = 5 (so then your answers would be x=2 and y=5) (and if you need it in point form then the answer would be (2,5))
