Solve for both systems: 5y+7x=131 and y + 8x = 145

y + 8x = 145

y + 8x -8x= 145-8x

y= 145-8x

5y+7x=131

5(145-8x)+7x=131

5(145) (5)(-8x)+7x=131

725-40x+7x=131

725-33x=131

725-725-33x=131-725

-33x=-594

-33x/-33=-594/-33

x=18

y= 145-8x

y= 145-8(18)

y= 145-144=1