-3x+y = 7
x-y = -3
Add both equations together to eliminate y:
-2x = 4
Divide both sides by -2 to find the value of x:
x = -2
Substitute the value of x into the original equations to find the value of y:
Therefore: x = -2 and y = 1
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
You cannot solve one linear equation in two unknown variables.
3x - 2 = 2x + 4 3x - 2x = 4 + 2 x = 6
Watch closely:6x = 3x + 27Subtract 3x from each side:3x = 27Divide each side by 3:x = 9
y=16 x= -4
(2,-2)
By elimination: x = 3 and y = 0
The elimination method only works with simultaneous equations, hence another equation is needed here for it to be solvable.
3
23
x=7
x = -8
x2 plus 3x plus 3 is equals to 0 can be solved by getting the roots.
-3x + 5 = 20 -3x = 15 x = -5
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
x = -8