Question

solve 3x + y = 7 and 2x + 3y = 1 useing elimination method

Answer 1

Answer:

Step-by-step explanation:

3x + y -= 7

2x + 3y = 1

So first, you want to make the both x values the same, or the y

In this case, I would go for y, which mean, you times the whole of the first equation by 3, to get 3y which will give u:

9x + 3y = 21

2x + 3y = 1

Now, you have the y values the same, so they cancel out which means, you add  the rest of the equation because a + and + gives you +. So now you have :

9x + 2x = 11x

21 + 1 = 22

so your new equation is:

11x = 22

You divide by 11 to get x by itself

and you need to do it to both sides which give you:

x = 2

Now, you can substitute the value of x(2) into any of the ORIGINAL equations

I'd substitute it into this equation:

2x + 3y = 1

=

2(2) + 3y = 1

4 + 3y = 1

You subtract 4 from both sides which leaves you with :

3y = -3

Divide both sides by 3

and now you have your answer as y = -1

x = 2

y = -1

I hope this helped!