help please

[slow bough]

Can someone help me please

[west dirge]

first system:
24x+10y=42
-24x-27y=-144
-17y=-102
y=6
8x+9(6)=48
x=-0.75

second system:
8.5y=51
y=6
8x+9(6)=48
x=-0.75

[slow bough]

Thank u but I have one question where you get a 24 and 10