1) Y=2x-4
2) x-Y=1
Since you already have Y alone in the first equation, plug the first equation into the second equation. This will give you:
2) x-(2x-4)=1
Now solve for X. To do this, first change the signs of (2x-4) since it is being subtracted. This gives you:
2) x-2x+4=1
Subtract 4 from both sides, giving you:
2) x-2x=-3
Combine like terms, giving you:
2) -x=-3
Of course, from this we can see that x=3.
Now plug x=3 into equation 1) Y=2x-4 which gives you:
1) Y=2(3)-4
Solve for Y. Y=2
X=3 Y=2
5
y = 3x + 1 y = 3(1) + 1 y = 3 + 1 Y = 4
If [ y = x + 2 ], then x is not -1 when y = 5.If [ y = x + 2 ],then when x = -1, y = 1,and when y = 5, x = 3.
Which means 0 = -1!
x = 1 and y = -2
The solution is: x = 1 and y = -1
-1
In the equations Y=X-1 and Y=-X+1, the solution is (1,0)
y=10
If: x = -5 Then: y = (3*-5)-1 = -16
-1
Y = 2X + 1 Now it is.