Question

use elimination method



2x+3y=18 and -7x+9y=15​

Answer 1

Answer:

2x + 3y=18 ----------------- (i)

-7x + 9y=15 ----------------(ii)

(i) * 3

6x + 9y = 54 --------------(iii)

(ii) * [-] change the sign of each element in that equation

7x - 9y = -15 -----------------(iv)

evaluate (iii) and (iv)

6x + 9y = 54

7x - 9y = - 15

___________

13x +0 = 39

13x = 39

x = 39

3

_____

x = 3

_____

subs x value in (i)

2x + y = 18

2 (3) + y = 18

6 + y = 18

y = 18 - 6

_____

y = 4

_____

therefore | x = 3 | | y = 4|

Answer 2

Answer:

yes that is parabola diagramm