consider the following system of equations 2x+3y=45 x+y=10 what is the x value of the solution for this system

x + y = 10.....y = 10 - x....so we sub in 10 - x for y in the other equation

2x + 3y = 45
2x + 3(10 - x) = 45
2x + 30 - 3x = 45
2x - 3x = 45 - 30
-x = 15
x = -15 <===