Question

Solve the system of equations by substitution
x=-4y
x+5y=2
a.(-8,2)
b.(8,-2)
c.(2/9,-8/9)
d.(-12,3)

How do I do this problem?

Answer 1

It tells you the vale of x right ? So just plug in the value of x into equation 2
-4y+5y=2
Now solve the equation for y tell me what you get

Answer 2

Ye solve for y
-4+5=?

Answer 3

1

Answer 4

Ok so 1y=2
Now divide both sides by 1
2/1=?

Answer 5

it would just be 2 i think?

Answer 6

Good so y=2
Now to solve for x...
Now that we know the value of y we can plug in 2 (into equation 1) to figure out the x value
-4 x 2 = ?

Answer 7

so -8?

Answer 8

Yes so x=-8 y=2
which coordinate matches the answer?

Answer 9

so the answer is a? and what do you mean?

Answer 10

A is correct :)

Answer 11

Thanks again!

Answer 12

:)