X=area of Sahara. y=area of the Gobi Desert. We suggest this system equations: x+y=4000000 x=7y solve by susbstitution method. (7y)+y=4,000,000 8y=4,000,000 y=4,000,000 / 8=500,000
x=7y x=7(500,000)=3,500,000
The area of Sahara=3,500,00 miles². The area of the Gobi Desert=500,000 miles²
To check: Te sum of their areas is : 3,500,000 miles²+500,000 miles²=4,000,000 miles² Te area of sahara (3,500,000 miles²) is 7 times the area of the Gobi Desert (7*500,000 miles²=3,500,000 miles²).
A line is 180 degrees. I found the degree of the angles in-between 126 and M by subtracting 126 from 180. This means that M is also 126. (Plus the intersecting lines are parallel)
A number that cannot be expressed that way is irrational. For example, one third in decimal form is 0.33333333333333 (the threes go on forever). However, one third can be express as 1 divided by 3, and since 1 and 3 are both integers, one third is a rational number.
