Answer:

Step-by-step explanation:
We are given this system of equations:

We use elimination to solve to eliminate one of the variables, so we only have to work with one at a time. We do this by adding and subtracting the equations, and sometimes multiplying the entire equation by a number.
Notice how both equations have a 4x. This means they can easily be eliminated, without multiplying the equations by another number first. Let's subtract the 2 equations.

The 4x will cancel because 4x-4x=0.

Since there are back to back negative signs, they become addition signs.


We are solving for y , so we must isolate the variable. It is being multiplied by 3 and the inverse of multiplication is division. Divide both sides by 3.

Now we can substitute 3 in for y in the original equations. Let's use the first one.

3 is being added to 4x. The inverse of addition is subtraction. Subtract 3 from both sides.

x is being multiplied by 4. The inverse of multiplication is division. Divide both sides by 4.

x is equal to 1 and y is equal to 3. Coordinate points are written as (x, y). The solution to this system of equations is (1, 3).
Answer:
y = 
Step-by-step explanation:
5y = 3x - 4
divide both sides by 5 to isolate the y:
y = 
Answer: -4
Step-by-step explanation: I am guessing you meant ...99 + 2(8*3)...
3x + 99 + 2(8 x 3) = 135
3x + 99 + 2(24) = 135
3x + 99 +48 = 135
3x + 147 = 135
(3x + 147) - 147 = (135) - 147
3x = -12
(3x) ÷ 3 = (-12) ÷ 3
x = -4