Please answer urgent!

First thing we need to do is find the slope. since this equation is already in slope intercept form, which is y = mx + b, the slope is already shown. It is 1/2

The slope of the line perpendicular to the given line is the negative inverse of the slope. The negative inverse of 1/2 is -2.

Next, use the slope we determined was the negative inverse ( -2 ) and the given point ( 1,3 ) to write the equation of the line in point slope form. The formula is y − y1 = m(x − x1).

With all the correct numbers plugged in, The equation is:

y - 3 = -2 ( x - 1 )

$20.5

Step-by-step explanation:

Let x  denotes the amount for total bill.

We are given that ,  Sierra left $4.50 as a tip for a waiter.

This was 18% of the bill before the tip.

We can write 18% = 0.18. [To convert percent into decimal we divide it by 100.]

Then, the tip amount = 0.18 x Total bill

So, the total bill amount = $25

Hence, her total bill before the tip= Total bill amount - Tip amount

= $25- $4.50=$20.5

Thus ,her total bill before the tip= $20.5