Where does the line y= -3x+7 cross the y-axis

(0, 7 )

Step-by-step explanation:

Where the line crosses the y- axis the x- coordinate of the point is zero.

Substitute x = 0 into the equation and evaluate for y

y = - 3(0) + 7 = 0 + 7 = 7 ⇒ (0, 7 )

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,