4X + 5Y = 21
-4X + 8Y = -8
And
X + 5Y = 5
3X - 5Y = 3

for the first one

Step-by-step explanation:

(x,y)=(4,1)

50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.