Answer:
x = 2
y = 3
Step-by-step explanation:
[tex]\left \{ {{0.4x + 0.3y = 1.7} \atop {0.7x - 0.2y = 0.8}} \right.[/tex]
[tex]\left \{ {{2(0.4x + 0.3y) = 2 * 1.7} \atop {3(0.7x - 0.2y) = 3 * 0.8}} \right.[/tex]
[tex]\left \{ {{0.8x + 0.6y = 3.4} \atop {2.1x - 0.6y) = 2.4}} \right.[/tex]
[tex]2.9x = 5.8[/tex]
[tex]29x = 58[/tex]
[tex]x = 2[/tex]
[tex]0.3y + 0.4x = 1.7[/tex]
[tex]0.3y + 0.4 * 2 = 1.7[/tex]
[tex]0.3y + 0.8 = 1.7[/tex]
[tex]0.3y = 0.9[/tex]
[tex]3y = 9[/tex]
[tex]y = 3[/tex]
