Question

Graph the following system of equations.

y = 3x + 15
3x + 3y = 9

What is the solution to the system?

Answer 1

(-3,6) i cant explain how but i used this calculator here’s a pic

Answer 2

x = -3 and y = 6

Explanation:

by plugging the function (y = 3x + 15) into the y value in the function (3x + 3y = 9), you can then solve to find that x = -3

After solving for the x-value, plug -3 into the easiest equation to solve for the y-value (y = 3x + 15) to then find that y = 6

This is method of solving is called substitution