Help me please lol. Timed test

y=1/2x-7

Step-by-step explanation:

We know the slope is 1/2, and the equation for a linear equation is y=mx+b, but we can substitute m for 1/2 as that is the slope.

Doing this we get y=1/2+b, and now we can plug in the x and y values given, and solve for b to get the equation.

Plugging in we get:

-9=-4(1/2)+b

-9=-2+b

-7=b

This means the equation is y=1/2x-7, or the first option.

cut 138 centimeters off

step-by-step explanation:

250-112 = 138