Question

solve equations 11x-15y =20 and x+y=42​

Answer 1

Answer:

What to do in this question

Answer 2

Answer:

» 11x - 15y = 20 ... (1)

» x + y = 42 ... (2)

from (2) x = 42 - y substitute in (1)

» 11 (42 - y) - 15y = 20

» 462 - 11y - 15y = 20

» 26y = 442

» y = 17

Substitute in (2), we get

» x = 25

Therefore, (x, y) = (25, 17)