Sergio's and Not Brad Joe's Math Blog

3.2 Solving linear SystemsAlgebraically

3x+4y=-4

x+2y=2

Solve equations 2 for x:

x+2y=2

Subtract 2y to the other side of the equation.

Substitute the expression for x into equation 1 and solve for y.

3x+4y=-4

3(-2y+2) +4y=-4

y=5

Substitute the value of y into revised equation 2 and solve for x

x=-2y+2

x=-2(5) +2

X=-8

The solution is (-8,5)

Problem II (without words)

2x+2y=0

6x+y=-10

2y=-2x

y=x

6x+(-x)=-10

6x-x=-10

5x=-10

x=-10/5= -2

y=x

y=-(-2)

y=2

(2,2)

This year we learned several things!!! Like that the number one cause of depression in the united states Is math!!! Its a proven fact, google it. Its LEGIT