Question

solve by elimination method.
0.3x-0.2y=4
0.5x+0.3y=-7/17

Answer 1

....... fractions and decies eh

Answer 2

0.3x-0.2y=4
0.5x+0.3y=-7/17 ; *10 the whole shebang

3x- 2y=40
5x+ 3y=-70/17 <- *17


3x- 2y = 40
85x+51y=-70

Answer 3

3x- 2y = 40 <- * -85/3 i spose
85x+51y=-70

Answer 4

-85x +(85)2/3y = -(85)40/3
85x +51(3)/3y= -70(3)/3
---------------------------
323/3y = -3610/3

y = -3610/323

thats messy

Answer 5

i got that far, but am lost right after that

Answer 6

Instead of substituting back in y to get x, you could try multiply top by 51 and bottom by 2
153x -102y = 2040
170x +102y = -140
__________________
323x = 1900
x = 1900/323