Answer:
A simple way to mentally subtract is to simplify the numbers, subtract, then subtract or add for the simplified answer.
Step-by-step explanation:
A simple way to mentally subtract is to simplify the numbers, subtract, then subtract or add for the simplified answer. For this 304 - 81 is easier as 300 - 80. Make note that we took away 4 from 304 and 1 from 81. Now we just subtract mentally, and 300 - 80 = 220. If we took 4 from 304, this means that our answer should be 4 less, since 4 less would be 304 - 80 = 216. If we took 1 from 81, then we add 1 back to get the equation 304 - 81 = 217.
304 - 81 = ?
300 - 80 = 220
304 - 80 = 216
304 - 81 = 217
Answer:
Step-by-step explanation:
The answer I believe would be 2Y + 3x=6
<span>x − y + 2z = 1
3x + y + 5z = 19
2x − y − 2z = −17
-3x+3y-6z=-3
</span>3x + y + 5z = 19
4y-z=16 (1)
-2x+2y-4z=-2
<span>2x − y − 2z = −17
y-6z=-19 (2)
</span>4y-z=16 (1)
y-6z=-19 (2)
4y-z=16
-4y+24z=76
23z=92
z=4
y-6z=-19
y-6×4=-19
y-24=-19
y=24-19
y=5
<span>x − y + 2z = 1
</span>x-5+2×4=1
x-5+8=1
x+3=1
x=-2
(x,y,z)=(-2,5,4)
