Are you kidding me, bro? lol
276-115=131
131 divided by 276 = 0.47
0.47% increase
Given the system of equations:

To solve it by substitution, follow the steps below.
Step 1: Solve one linear equation for x in terms of y.
Let's choose the second equation. To solve it for x, add 3y to each side of the equations.

Step 2: Substitute the expression found for x in the first equation.

Step 3: Isolate y in the equation found in step 2.
To do it, first, add 48 to both sides.

Then, divide both sides by 15.

Step 4: Substitute y by 5 in the relation found in step 1 to find x.

Answer:
x = -9
y = 5
or (-9, 5)
Also, you can graph the lines by choosing two points from each equation, according to the picture below.
Use the Pythagorean theorem:

The ladder will reach approximately 14.14 feet (exactly 10√2 feet) up on the building.
Answer:
13
Step-by-step explanation:
3y + 6 ÷ 2x = 3(4) + 6 ÷ 2(3) = 12 + (6 ÷ 6) = 12 + 1 = 13
Answer:
0,-4
Step-by-step explanation:
the crossing point is on the y-axis the y is always on the rigth (x,y)