Question

How do you find x and y coordinates only given the problems: 3x-y=11 and 5y-7x=1

PS I need to know by tomorrow: 1/9/19

Answer 1

x=7 and y=10 or (7,10)

Explanation:

3x-y=11..........(1)

-7x+5y=1............(2)

Fr om equation (1)

y=3x-11

now we will put this value in (2)

-7x+5y=1

-7x+5(3x-11)=1

-7x+15x-55=1

8x=56

x=56/8

x=7

now put this value of x in (2)

-7x+5y=1

-7(7)+5y=1

-49+5y=1

5y=1+49

y=50/5

y=10

hence coordinates are

(7,10)