Answer:
60
Step-by-step explanation:
To be parallel, the expressions need to be EQUAL.
So we equate 2x + 30 with 4x - 90 and find the value of x:
[tex]2x+30=4x-90\\30+90=4x-2x\\120=2x\\x=\frac{120}{2}\\x=60[/tex]
Hence, x = 60 would show the lines are parallel.
