What is the verb phrase in the sentence? i could not read the doctor's handwriting

Not read would be the verb phrase in that sentence because the rest of the sentence is not a verb.
A verb phrase means a group of two or more words in a sentence so not read would be the verb phrase

To be honest i really don’t know but ask some one else they will tell u

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

answer: x = 4 and y = 4