Answer:
Answer letter D
Step-by-step explanation:
-3x + 3y = 9
2x - 7y = -14
Let's start by simplifying both equations:
-3x + 3y = 9 (divide everything by 3)
2x - 7y = -14 (divide everything by 2)
We will then have:
-x + y = 3
x - y = - 7
Then we sum both equations, eliminating x and isolating y to find its value!
y + (- y) = 3 + (- 7)
y + (-
y) = - 4
Summing the fractions of y we have
- y = - 4 .: y =
.: y = 1
(we found y!)
Now we substitute y in one of the previous equations to find x:
-3x + 3 × ( ) = 9
-3x + = 9
-3x = 9 -
-3x = -
-3x =
x = ÷ -3 (this is tricky, but it's the same as
× -
)
x = - .: x = - 1
(finally found x!)
Bringing everything together we have:
x = - 1
y = 1
I hope it helps :)