SOLVING USING SUBSTITUITION BOARD PROBLEMS FOR APR 13 1) X = 2Y 4) X – 3Y = 3 7) ½X – 2Y = 17 4X + 2Y = 15 2X + 9Y = 11 2X + Y = 104 2) 3X + Y = 6 5) 6X + 2Y = 4 8) 8X + 6Y = 44 !
Y + 2 = X 4X – 2Y = 1 𝑋 − 2𝑌 = −3 !
3) 2X – Y = – 4 6) 3X + 5Y = 2X 9) .3X + .2Y = .5 -­‐3X + Y = -­‐ 9 X + 3Y = Y .5X – .3Y = .2 ANSWER KEY !
1) (3, 1½ ) 4) (4, ! ) 7) (50, 4) !
!
2) (2, 0) 5) (! , ! ) 8) ( 4, 2) 3) (13, 30) 6) ( 0, 0) 9) (1, 1)