1. 3x + y = 15 y = 2x

Solving the following systems by using substitution
NEED HELP ASAP PLEASE

x = 3

Step-by-step explanation:

Plug in for Y :

3x + y = 15

3x + 2x = 15

Combine Like Terms:

3x + 2x = 5x

5x = 15

Divide:

x = 15 / 5

x = 3

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.