In order to solve a proportion you need to cross multiply, so you would do:
4x20 and 9xX and you would get...
9x=80
then divide by nine to get
x=8.8888888889
which is technically 8.9
9514 1404 393
Answer:
2.25
Step-by-step explanation:
Add the square of half the x-coefficient to complete the square.
(-3/2)² = 9/4 = 2.25
Answer: (0, 5) and (-2, 0)
<u>Step-by-step explanation:</u>
10x - 4y = -20
Let x = 0, then 10(0) - 4y = -20
-4y = -20
<u> ÷ -4 </u> <u>÷ -4 </u>
y = 5
Let y = 0, then 10x - 4(0) = -20
10x - 0 = -20
<u> ÷10 </u> <u> ÷10 </u>
x = -2
Answer:
B, C,
Step-by-step explanation:
A - This is addition. Finding a product refers to multiplication, so this is not correct.
B - This is multiplication of 5x × 5y, exactly two factors, so this is correct.
C - This is multiplication of (x-y) × (x+y). Each equation inside the parenthesis equals one factor, so this is multiplication of exactly two factors. This answer is also correct.
D - This is multiplication of three factors, x × y × z, and is not correct.
