Question

I can solve it but I need to find the right steps, study guide questions

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

3x + y = 8
−x − y = −7

Answer 1

So for this question you can solve for x in the second equation.

x = 7 - y, so you substitute this expression into the x in the first equation.

it will look lie this ..... 3(7 -y) +y = 8

Answer 2

like*

Answer 3

so wait how did you know how to get the 7-y

Answer 4

all you do is rearrange the second equation for x. You now know what x is, it is 7 -y. so now you can use 7 - y instead of x.