4. solve by Substitution
-3x + 2y = 11
x = y + 4

Question

bella2025 · Answer

-3x+2(1)=11
am I right

bella2025 · Answer

-3x+2=11
            -2
-3x=9/-3
x=-3

Joe348 · Answer

so what you want to do  is plug in the second equation into the first equation

Joe348 · Answer

it would look like this

bella2025 · Answer

@joe348 wrote:

it would look like this

I see what I did wrong I was trying to solve for y first instead of x

bella2025 · Answer

@joe348 wrote:

it would look like this

-3(1y+4)+2y=11

Joe348 · Answer

no

Joe348 · Answer

it should be $$-y-12=11$$

Joe348 · Answer

then add 12 on both sides

bella2025 · Answer

where do you get 12

Joe348 · Answer

$$-y=23$$

Joe348 · Answer

@bella2025 wrote:

where do you get 12

I substitued the second equation for the first equation

Joe348 · Answer

so like this ...

Joe348 · Answer

$$-3(y+4)+2y=11$$

Joe348 · Answer

then i simplied it with $$-y-12=11$$

Joe348 · Answer

then on both sides you add 12

Joe348 · Answer

$$-y=23$$

bella2025 · Answer

@joe348 wrote:

$$-y=23$$

where did you get -y

Joe348 · Answer

then divided by that -y and you get $$-23$$

Joe348 · Answer

@bella2025 wrote:

@joe348 wrote:

$$-y=23$$

where did you get -y

okay you see the 2nd equation plugged in?

Joe348 · Answer

after that i simplified the equation

Joe348 · Answer

like i was saying $$y=-23$$

Joe348 · Answer

so since $$y=-23 $$ you want to plug that in for the second equation to figure out what X is

Joe348 · Answer

so you know the second equation is $$x=y+4$$ so you plug $$-23 $$ for y

Joe348 · Answer

so $$x=-23+4$$ then subtract that and you should get $$x=19$$

Joe348 · Answer

so your final answer are $$x=19 \ and\  y=-23$$

Joe348 · Answer

did i help in any way or are you still confused?

bella2025 · Answer

@joe348 wrote:

did i help in any way or are you still confused?

no I figured it out

Joe348 · Answer

oh okay good