Help me to do this question of math plz plz I will mark as brainlist plz plz plz plz

Which ordered pair in the form (a, b) is a solution of this equation?

Evgen [1.6K]

3a - 4b = 21

check (-2 , -3)

3(-2) -4(-3) =21

-6 +12 = 21

6 does not = 21 so NO

check (0 , 7)

3(0) -4(7) =21

0-28=21

-28 does not equal 21 so NO

check (-3 , -2)

3(-3) -4(-2) =21

-9 +8 = 21

1 does not = 21 so NO

check (7 , 0)

3(7) -4(0) =21

21 = 21

Choice D

5 0

4 years ago

Divide -5/9 by 5/7 : a)-7/9 b)-9/7 c)7/9 d)9/7

Reil [10]

Answer:

a

Step-by-step explanation:

-5/9 ÷ 5/7

= -5/9 × 7/5

= -7/9

The answer should be a

4 0

3 years ago

Simplify – 2(7x – 3)

ANTONII [103]

All you need to do here is multiply the outside number by both 7x and -3.

When done correctly it should look like this:

-14x+6

Thats the answer.

7 times 2 gives you 14 but when multiplying mixed signs it turns negative so it would be -14.

negative 3 times negative 2 gives you 6. Both signs are negative, and you would suppose it would turn into a negative but thats only true when both signs are mixed. Both the 3 and the 2 are negative, making the signs the samez giving you positive

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5 0

3 years ago

What value of c makes the polynomial below a perfect square? 4x2 + 12x + c?

Tema [17]

This is what we know:4x^2 + 12x + c = (2x + k)^2
 4x^2 + 12x + c = 4x^2 + 2kx + 2kx + k^2
c=9

6 0

3 years ago

Read 2 more answers

Your checking account has a balance of –$82. You deposit $59. How much more do you need to deposit to have a balance of $50? The

Mice21 [21]

E importance of reconciling a bank statement. ... Demonstrate the ability to balance a checkbook and ... She only needs $25, but ... Alexis has no idea how ... As a customer, you should be familiar with the fees at your bank. If you ... a safe place until you get home; then use it to record howmuch you removed from.

6 0

3 years ago

Read 2 more answers

Help me to do this question of math ​plz plz I will mark as brainlist plz plz plz plz

Help me to do this question of math plz plz I will mark as brainlist plz plz plz plz