Ms.Juan 6th pd.team 5

LINEAR EQUATIONS

100

-5x+4y+=-16

-5x+4y=-16

step 1: 5x=-6-4y

step 2: x=6/5+4/5y

answer or Y-intercept: 6/5+4/5y

200

1+7=4+x

1+7=4+x

step 1: 8=4+x

step 2: -x=4-8

step 3:-x=-4

step 4: x=4

300

20x+30y=180

20x+30y=180

step 1: 20x=180-30y

ANSWER: x=9-3/2 y 

400

-9=-4X-7Y

-9=-4X-7Y

STEP 1: 4X=-7Y+9

ANSWER: X=-7/4Y+9/4

https://www.desmos.com/calculator

500

4(4X)=2(X)=72

4(4X)=2(X)=72 

STEP1: 16X+2X=72

STEP2: 18X=72

ANSWER: X=4

SYSTEM OF EQUATIONS

100

Y=1/3X+3

Y=1/3x+3Y

step 1: Y=2x-2

step 2: 1/3x+3=2X-2

step 3:X=3

step 4: Y=1/3 X 3+3

step 5: y=4

answer: (x,y)=(3,4)

200

7x - 4=-7

7x - 4=-7

5x +y=22

{x= - 3/7