<span>A) 2x - 7y = 13
B) 3x + y = 8
Multiplying equation B by 7
B) 21x + 7y = 56 then adding it to A
</span><span>A) 2x - 7y = 13
23x = 69
x = 3
y = -1
</span>
Answer:
AB = 25 units
Step-by-step explanation:
In right triangle ACB, 
Therefore, by geometric mean property:
AB = AD + DB
AB = 20 + 5
AB = 25 units
One way to solve this is to revert to integers.
Do this by moving the decimal in 1.3 to the right 6 places (indicated by the positive power value) and then 6.8 move the decimal to the right 5 places (same reason)
Now you have 1,300,000 & 680000. Subtract to get 620,000.
Now convert your product to scientific notation again by moving your decimal to the left until you are left with 6.2 x ? The question mark will be 10 to the number of places you moved the decimal. 10^5
We have 6.2 x 10^5.
It is import to note that when the decimal must be moved to the right for values less than one, the power will be negative.
2/3 can also be written as 2:3 or 4:6 or 4/6…8:12…8/12…
Answer:
B
Step-by-step explanation:
y2-y1 / x2-x1
2+5/-3-1
-7/4
