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
y = 5x + 17
a perpendicular line will be the opposite reciprocal slope of the given equation. the slope given is -1/5 so the opposite reciprocal is 5
find b:
7 = 5 (-2) + b
7 = -10 + b
17 = b
write equation
answer: 12
because yes