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you mean: y= -3x+1 y+x=-3+1 solve -3+1= -2 y+x = -2
You need more information to solve for x and y. One answer is x=3 and y=1.
x + y = 1 therefore x = 1 - y. 2x - y = -2 substituting x = 1 - y in this equation gives 2*(1 - y) - y = -2 That is, 2 - 2y - y = -2 or -3y = -4 => y = 4/3. Then x = 1 - y => x = 1 - 4/3 = -1/3. Therefore, the solution is (x, y) = (-1/3, 4/3).
Since the equation is in terms of x, you need to switch the x's and y's, and then solve it for y again. y=3x^3 --> x=3y^3 --> y=(x/3)^(1/3)
If: x+y = 4 and y = 2x+1 Then: 4-x = 2x+1 => 3 = 3x => 1 = x So by substitution: x = 1 and y = 3