Create an equivalent system of equations by replacing one equation with the sum of that equation and a multiple of the other. Show the steps to do this.

-3x + 7y = -16
-9x + 5y = 16

Question

Create an equivalent system of equations by replacing one equation with the sum of that equation and a multiple of the other. Show the steps to do this.

-3x + 7y = -16
-9x + 5y = 16

kittiwitti1 · Answer

$$\text{isolate a variable of ONE equation}$$$$\text{and stick that equation in replacement of}$$$$\text{the corresponding variable in the OTHER equation}$$did that  help mero?

anonymous · Answer

idkkk im soo stumped on this

kittiwitti1 · Answer

i can't give you the answer bluntly mero
what part don't you get?

anonymous · Answer

idk i think you have to  add them both together

anonymous · Answer

but im not sure

kittiwitti1 · Answer

no no what part of my explanation don't you get
(i might not have answered correctly though...)

anonymous · Answer

no i get what your saying use the substitution method but i dont think thats they way to solve this

kittiwitti1 · Answer

oh.

kittiwitti1 · Answer

how about multiplying the first equation by -3?$$-3(-3x+7y)=(-16\times-3)$$

kittiwitti1 · Answer

then you can take the x out and solve for y

anonymous · Answer

yeahh im getting the multiply part i just dont get the sum part

kittiwitti1 · Answer

|dw:1420325586953:dw|

kittiwitti1 · Answer

still confused mero?

anonymous · Answer

no i think i got it now thanks so much!

kittiwitti1 · Answer

no problem~ o vo