<span>3x + y = 9 (I)
</span><span>y = –4x + 10 (II)
------------------------
</span>

Pass the incognito "4x" to the first term, changing the signal when changing sides.
<span>-------------------------
simplify by (-1)
</span>

<span>
-------------------------
</span>

<span>
-------------------------
</span>

<span>
-----------
</span>

<span><span>
</span></span><span>Substitute in equation (I) to find the value of "Y".
</span>3x + y = 9 (I)
3*(1) + y = 9
3 + y = 9
y = 9 - 3

Answer:

Answer:
7 1/2 divided by (4 1/2 - 5 1/8)=-12
Step-by-step explanation:
PLZZ MARK BRAINLIEST!!!!
Answer is -12
Answer:
option A: 120°
Step-by-step explanation:

Answer:
-3/4 pi radians
Step-by-step explanation:
<em>180° is 1 pi radian</em>
Hence, -<em>135° = -135/180 pi radians</em>
= -0.75 pi radians
= -3/4 pi radians
Answer:
f(1) = 42
Step-by-step explanation:
Step 1: Switch all x out to 1 for f(1) which would look like this: f(1)=4(1)^2+3(1)+13
Step 2: You would then simplify it starting with 4(1)^2 which would equal 4 squared which equals 16.
Step 3: After simplifying you would have f(1)=16+3+13
Step 4: You then just add and get 42
Hope this helped :D