What is 6x-3y=15; 7x+4y=10

The two equations given are

6x - 3y = 15

Dividing both sides of the equation by 3, we get

2x - y = 5

y = 2x - 5

And

7x + 4y = 10

Now we put the value of y determined from the first equation in the second equation, we get

7x + 4y = 10

7x + 4 (2x - 5) = 10

7x + 8x - 20 = 10

15x - 20 = 10

15x = 10 + 20

15x = 30

x = 30/15

= 2

Putting the value of x in the second equation we get

7x + 4y = 10

(7 * 2) + 4y = 10

14 + 4y = 10

4y = 10 - 14

4y = - 4

y = - (4/4)

= - 1

So the value of x is 2 and the value of y is - 1.