3(4x - 7y = 28)
-2(6x - 5y = 31)
12x - 21y = 84
<u>-12x + 10y = -62
</u> 0 - 11 y = 22
<u>
</u>y = 22/-11
y = -2
12x - 21y = 84
12x - 21(-2) = 84
12x + 42 = 84
12x = 84 - 42
12x = 42
x = 42/12
x = 3.5
Plug in each variable, put the variable answer is parentheses, that might help things go faster,.
Because of communicative properties, it won't matter what way you put it bevause it's still "2" and '5"
Answer:
100
Step-by-step explanation:
It's (10-7)=3 wide and (17-7)=10 high
So the perimeter is
P=2(3+10)=26 units