Which is true about the line whose equation is y + 3 = 0? the slope is zero. the y-intercept is 3. the slope is 3. the value of x always equals the value of y.

The slope is zero.

Step-by-step explanation:

The y-int is -3, the slope can't be 3, and the value of x isn't equal to y, if it was the lines would be intersecting

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm