41.5
Just enter it in a calculator
Answer:
your answer should be b= 17
X + y = 40.....multiply by -4
4x + 6y = 180
-------------------
-4x - 4y = -160 (result of multiplying by -4)
4x + 6y = 180
------------------add
2y = 20
y = 20/2
y = 10 <===
x = 30
Answer:
f(x) is y so the x=16 because 4*4=16