Given: 8x - 3y = -21, 3x + y = -10; Prove: x = -3

The answer to your question is given below

Step-by-step explanation:

8x – 3y = –21 (1)

3x + y = –10 (2)

To prove that x = – 3

Do the following:

8x – 3y = –21 (1)

3x + y = –10 (2)

Make y the subject in equation 2

3x + y = –10

Rearrange

y = –10 – 3x

Substitute the value of y into equation 1

To get the value of x.

8x – 3y = –21

y = –10 – 3x

8x – 3(–10 – 3x) = –21

Clear bracket

8x + 30 + 9x= –21

Collect like terms

8x + 9x = –21 – 30

17x = –51

Divide both side by 17

x = –51 / 17

x = – 3

34=68=912=1520=1824

Step-by-step explanation:

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