Afirst number plus twice the second number is 7. twice the first number plus the second totals 20. find the number

As per the problem

A first number plus twice the second number is 7

Twice the first number plus the second totals 20

Let the first number is x and second number is y then we can write

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,