Substitution
What is step #5 for both elimination and substitution?
CHECK YOUR ANSWERS
What is 47 - (-23)?
x+y=10
x-y=2
(6,4)
2x+3y=20
-2x+y=4
(1,6)
What school does Alejandra go to?
What is Cristo Rey?
What does substitute mean?
to put in the place of another or plug in
What do you with your equations when you have opposite coefficients?
ADD
3y-2x=11
y+2x=9
(2,5)
3x-y=5
x+y=3
(2,1)
What college is Margarita going to?
What is TCU?
what equation do you HAVE to start with?
either one
What do you with your equations when you have equal coefficients?
SUBTRACT
2x+3y=5
y+2x=7
(4,-1)
2x+ y = 7
4x + y = 5
(-1, 9)
What college is Zavier going to?
What is Louisiana Tech?
When doing step #1 (isolate one variable), which equation should you choose to isolate?
The equation that has a variable with a coefficient of +1 (the equation that has a positive variable by itself)
What is step #2 of the elimination method?
Identify equal or opposite coefficients
y=5x+3
y=-8x+16
(1,8)
x + y = 5
3x – y = 7
(3, 2)
Who is the Dean of Faculty?
Who is Voncile?
what are you looking for in solving systems of equations?
*hint: desmos
the point where the lines intersect
What is step #1 in solving systems of equations using the elimination method?
What is standard form?
x = 19 - 4y
-3x+2y = -1
(3, 4)
x = 2y - 1
3x - 2y = 9
(5, 3)
What college does Angela go to?
What is Lehigh University?