Answer:
The equation of any straight line, called a linear equation, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept. The y-intercept of this line is the value of y at the point where the line crosses the y axis.
Step-by-step explanation:
It's the first one. y = 3x
proportional means they are just some multiple of the other.
15X=12X+12
Subtract 12X
3X=12
X=4
The rectangle length is 16.5 cm.
The rectangle width is 5.5 cm.