MATHEMATICS HIGH SCHOOL

Solve by elimination
8x+9y=-55
-8x+y=65

Answers

Answer 1
Answer:

8x+9y=-55
 -8x+y=65                 (+)

10y=10  /:10

y=1


-8x+1=65

-8x=64   /:(-8)

x=-8
Answer 2
Answer: 1. Add the 2 systems and get 10y = 10.
2. Divide both sides by 10 so you get y = 1.
3. Substitute that in either equation (I'm going to use the 2nd equation).
4. -8x + 1 = 65.
5. Subtract 1 from each side.
6. -8x = 64.
7. Divide by -8 on both sides.
8. x = -8.
9. Check in the other equation.
10. 8(-8) + 9(1) ?= -55
11. -64 + 9 ?= -55
12. -55 = -55

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How do i solve this question 2+3=8-4 ?

Answers

Answer:

5=4

Step-by-step explanation:
5=4

just add then subtract

Which of the following scenarios could be represented by the expression 6x+11y? A. The total weight of a box containing x 11-ounce packages of almonds and y 6-ounce packages of peanuts

B. The cost for x children and y adults to go to the movies if the adult tickets are $11 and the child tickets are $6

C. The number of kids in a school class if there are 6 girls and 11 boys

D. The total number of marbles in a jar if there are 11 green and 6 red

Answers

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If postage costs $.54 for the first ounce and $.22 for the each additional ounce, calculate the cost of mailing a 10- ounce envelope. A. $2.20 B. $5.08
C. $2.52
D. $5.40

Answers

Answer:

Hence, the total cost of mailing 10 ounces is:

$ 2.52

Step-by-step explanation:

If postage costs $.54 for the first ounce and $.22 for the each additional ounce.

i.e. cost of first ounce=$ 0.54.

Now let x denote the number of ounces after the first ounce,

Hence, the cost of x ounces=$ (0.22×x)=$ 0.22 x

Hence, the cost of mailing (x+1) ounces is: $ (0.54+0.22 x)

Now, we have to find the cost of  mailing a 10- ounce envelope.

i.e. after the first ounce we need 9 more ounces.

Hence, the total cost of mailing is calculated as:

=$ (0.54+0.22* 9)\n\n=$ (0.54+1.98)\n\n=$ 2.52\n

Hence, cost of mailing 10 ounces is:

$ 2.52
10-first oz=9oz
0.54 for first
0.22 times 9=1.98
total is 1.98+0.54=2.52

C

Which of the following represent dividing 72 by 6?a. 72 ÷ 6
b. 6/72
c. 6 ÷ 72
d. 72/6

Answers