Question

y =9 -2x, y =x -12 solve this simultaneous equation​

Answer 1

Answer:

$y = 9 - 2x$

$x - 12 = 9 - 2x$

$x + 2x = 9 + 12$

$3x = 21$

$x = \frac{21}{3}$

$x = 7$

$y = 7 - 12$

$y = - 5$

Answer 2

Answer:

x = 7

y = -5

is the right answer