Answer:
360 = x+123+ 90
x = 147
Step-by-step explanation:
The three angles form a circle which is 360 degrees
360 = x+123+ 90
Subtract 123 and 90 from each side
360 -123 - 90 = x
147 = x
Answer:
x = -7
Step-by-step explanation:
-1 + x = -8
x = -7
Step-by-step explanation:

[1] y = -x + 5
3x + 3•(-x +5) = 10
0 = -5 => NO solution