What is the value of r in the equation 4r − 8 = 5r + 12?
2 answers:
To find r, we have to isolate it on one side of the equation. We can do this by "undoing" the equation one step at a time.
4r - 8 = 5r + 12
4r - 8 - 4r = 5r + 12 - 4r
-8 = r + 12
-8 - 12 = r + 12 - 12
-20 = r
r = -20
Hope this helps!
Answer:
r= -20
Step-by-step explanation:
you need to solve this equation for the variable <em>r</em>, which means you need to get <em>r </em>alone on one side of the equation.
4r-8=5r+12
subtract 4r from both sides
-8=5r-4r+12
-8=1r+12
subtract 12 from both sides
-8-12=r
simplify
-20=r
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