Question

What are these called? I completely forgot.

What is the x value such that y =15 - 3x and y = 0?

Answer 1

Problem: y = 15 - 3x; 0 = 15 - 3x

I will try to solve your system of equations:

0 = - 3x + 15; y = - 3x + 15

Solve 0 = - 3x + 15 for x:

0 + 3x = - 3x + 15 + 3x (add 3x to both sides)

3x = 15

3x/3 = 15/3 ( divide both sides by 3)

x = 5


Substitute 5 for x in y = - 3x + 15

y = - 3x + 15

y = ( - 3)(5) + 15

y = 0 (Simplify both sides of the equation)

Answer: x = 5 and y = 0


Hope that helps!!!!

Answer 2

Your answer is x=5.

Y = 15-3x
Substitute 0 in for y (given). Then,solve the equation for x.

0 = 15 -3x
Subtract 15 to both sides.

-15 = -3x
Divide both sides by -3.

5= x