Question

In which line is a mistake first made when solving the following system of equations by substitution?
2x - y = -4
3x + y = -9


Line 1
2x - y = -4
y = 3x - 9

Line 2
2x - (3x - 9) = -4

Line 3
2x - 3x + 9 = -4

Line 4
-1x + 9 = -4

Line 5
-1x = -13

Line 6
x = 13

Answer 1

@Vijeya3

Answer 2

\[\huge\color{red}p \huge\color{orange}u \huge\color{yellow}p \huge\color{green}p \huge\color{blue}i \huge\color{magenta}e \huge\color{red}s \]

Answer 3

That would be Line 1
Sorry for the late reply..had been doing another question :'(

Answer 4

your okay! i really appreciate all your help!

Answer 5

^-^ np