Question

PLEASE HELP!!!
SOMEONE!!!

Answer 1

The answer is (7,0).
Let us try to solve this:

3a -4b =21
Let us substitute he first number, that is, 7 in place of ‘a’ and 0 in place of ‘b’.

The answer,
3(7) - 4(0) = ?
21 - 0 = 21
Therefore, the correct option is (7,0) as none of the other options fit the given equation.

Answer 2

7,0

Explanation:

Let's solve for a.

3a−4b=21

Step 1: Add 4b to both sides.

Step 2: Divide both sides by 3

Let's solve for b.

3a−4b=21

Step 1: Add -3a to both sides.

Step 2: Divide both sides by -4.