57 + 4x= 36 + 7x
Then you subtract 57 from 36
4x=-21 + 7x
Then you subtract 7x from 4x
7x = -21
Then you divide 7x by 7 and -21 by 7
X= 3
Let

Ben's age
Let

Daniel's age
We know:

and

Plug the value of

into the second equation:





Since Ben is 20 years older than Daniel, Ben is 13+20=33 years old.
Answer:
x= -3, y=-6
Step-by-step explanation:
In the equation -5x-y=21, substitute y for 6+4x:
-5x- (6+4x) = 21
^^Solve for x.
X should come out to -3. To find y, plug -3 into either equation (-5x-y=21 or y=6+4x) and y should equal -6.
Answer:
YES
Step-by-step explanation:
2(2) + 3(1) = 4+3= 7 then, 8(2) - 3(1) = 16 - 3 = 13
x=2
y=1