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Over [174]
3 years ago
13

Solve using your choice of graphing, substitution, or elimination​

Mathematics
1 answer:
antiseptic1488 [7]3 years ago
3 0

Answer:

x = 110, y = 153.

Step-by-step explanation:

4x - 3y = -19   Multiply by 2

3x - 2y= 24    Multiply by 3.

8x - 6y = -38

9x - 6y = 72      SUBTRACT

-x = - 110

x = 110

Substitute for x :

3(110) - 2y = 24

2y =330 - 24

2y = 306

y = 153.

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Simplify 8 over -3 divided by -4 over 9
Vesnalui [34]
8/-3 ÷ -4/9
8/-3 * 9/-4
72/12 = 6
6 0
3 years ago
Read 2 more answers
What is 2×(-5)-(-8)=<br>A. 79<br>B.-80<br>C.80<br>D.83<br>what is the answer?
saul85 [17]
The answer is -2 when you simplify
6 0
3 years ago
16. Two golfers completed one round of golf. The first golfer had a score
bearhunter [10]

9514 1404 393

Answer:

  9

Step-by-step explanation:

The extra shots can be computed from the difference in their scores:

  6 -(-3) = 6 +3 = 9

The first golfer took 9 more shots.

6 0
3 years ago
Factorise the following quadratic equations ​
vesna_86 [32]

Answer:

see explanation

Step-by-step explanation:

In 13 - 17

Consider the factors of the constant term which sum to give the coefficient of the x- term

13

x² - x - 42 = (x - 7)(x + 6)

15

x² + x - 6 = (x + 3)(x - 2)

17

x² - 27x + 50 = (x - 25)(x - 2)

19

r² - 25 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , thus

r² - 25

= r² - 5² = (r - 5)(r + 5)

5 0
3 years ago
Read 2 more answers
If 30g of sugar is needed to make 4 cakes how much grams of sugar is needed to make 7 cakes
arsen [322]
There's two ways to do this.

The first way:
Work out the amount of sugar needed to make one cake, and then multiply that by 7.

30 grams ÷ 4 cakes = 7.5 grams for 1 cake.
7.5 grams × 7 cakes = 52.5 grams for 7 cakes.

The second way:
Work out the ratio of sugar:cake by doing 7 ÷ 4, and then multiplying that value by 30.

7 cakes ÷ 4 cakes = 1.75
1.75 × 30 grams = 52.5 grams for 7 cakes. 

Either way, the answer is 52.5 grams.
6 0
3 years ago
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