[tex] \frac{x}{y} = \frac{3}{4} = > 4x = 3y \\ x = 4k \\ y = 3k[/tex]
2 • 4k - 3k = 45
8k - 3k = 45
5k = 45
k = 45 : 5
k = 9
x = 4 • 9
x = 36 ☑
y = 3 • 9
y = 27 ☑
Salut! :)
x/y = 4/3 => 3x = 4y
2x - y = 45 | × 3
6x - 3y = 135
8y - 3y = 135
5y = 135
y = 135 : 5
y = 27
x = ( 45 - 27 ) : 2
x = 18 : 2
x = 9
