* -21x + 9y = 66
21x + 28y = 28
37y= 94
y= 94/37
* -3x - 4y = -4
-3x - 4(94/37)= -4
-3x = -4 + (4*(94/37))
It’s only a vertical angle
Answer:
hope this helps
Step-by-step explanation:

14f + 7
“Product” means multiplication, so we can assume 14 and f are being multiplied (14f.) Add that to 7, and you have an expression! Have a great day.
Answer:
No
Step-by-step explanation:
4*3 = 12
5*1 = 5
12 + 5 = 17
17 = 19 <-- doesn't make sense