Question

solve by substitution
0.4x=1
3x-2y=9

how do i solve this problem im having issues trying to solve it please help!

Answer 1

so plug x=2.5 into your seconf eq instead of x and solve for y

Answer 2

second*

Answer 3

1/0.4=2.5
x=2.5
3(2.5)-2y=9
7.5-2y=9
-2y=1.5
-2y/2=1.5/2
y=-0.5

Answer 4

but what about the x

Answer 5

you already have x by itself in the forst eq: x=1/0.4=2.5

Answer 6

first*

Answer 7

so if i put it in pairs it would be (2.5,-0.75)

Answer 8

right?