The value of x in this system of equations is 1.
3x + y = 9
y = –4x + 10
substitute the value of y in the first equation:
combine like terms:
apply the subtraction property of equality:
apply the division property of equality:
3x + (–4x + 10) = 9
–x + 10 = 9
–x = –1
x = 1
what is the value of y?