Answer:
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Step-by-step explanation:
Answer:-2
Step-by-step explanation:
Since you have y alone on one side of the equation......
Use substitution and plug in 1/2x-4 for y in the other equation.

Distribute

Combine like terms

Add 8 to both sides

Divide by 4
and 
Plug this value in for x

Simplify

Multiply everything by 8 and simplify

Divide.....

Your answers are:

Y= 10x
y: number of cm
x: number of mm
Answer:
-2,3
Step-by-step explanation:
x = -2
y = 3
..........