10. 4x - 7y = 3

x - 7y = - 15

(2/5,-1/5)

Step-by-step explanation:

solve the second equation for x

x = - 7y - 1

replace the x in the first equation

4• (-7y-1) - 7y = 3

- 35y = 7

solve for y

35y = - 7

y = - 1/5

which gives us

x = - 7y-1

y = - 1/5

then use the y value to solve for x

x = - 7 (-1/5) - 1 = 2/5