9
If this is an equation you left out the equal sign. Do you mean y8=y12-4. If so add 4 to both sides. You have 4+y8=y12. Then substract y8 from both sides. You have 4=y4. Divide both sides by 4. You have y=1.
5
y = 3x + 1 y = 3(1) + 1 y = 3 + 1 Y = 4
The GCF of y3, y7, y8 is y3
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
y=10
If: x = -5 Then: y = (3*-5)-1 = -16
In the equations Y=X-1 and Y=-X+1, the solution is (1,0)