Minus 6 both sides
y-6=4x+rx
undistribute x
y-6=x(4+r)
dividie both sides by (4+r)

Hello there!
Standard form is used for large or small numbers. It is between 1 and 10 times 10 to the power of something.
In this case, your answer is 1.8 x

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Hope This Helps You!Good Luck :)
I am guessing you meant 9+10 which is 19