Which expression is equivalent to 3c(1/3d-9)-7(c+1)+d(c+4)?
1 answer:
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Answer:
l+m = 180°{being co-interior angle}
Step-by-step explanation:
Lets multiply equation (2) by -2 to get:
Now we can add equations (1) and (2) to eliminate x:
Now that we know the value of y, we can replace it in equation (1) to get the value of x:
We can conclude that both x and y are equal to 3.