Answer: written as (x,y)
1) (1, -4) 2) (1, -2) 3) (x, -23+7x) 4) (2,-2) 5) (6/5,1) 6) (6,13) 7) (1,2)
8) (23,-13/2)
Explanation:
step 1) 4x+3y=-8
y=-12+8x
step 2) 4x+3(-12+8x)=-8)
answer 1) x=1
step 4) y= -12+8*1
answer 1) y=-4
step 1) 4x-2(-2)=8
answer 2) x=1
check 2) 4*1-2(-2)=8
-2=-2
step 1) 14x-2(-23+7x)=46
answer 3) XeR (solution in parametric form)
Step 1) -3x+2(8-5x)=-10
answer 4) x=2
Step 2) y=8-5*2
answer 4) y= -2
Step 1) -5x+4y=-2 (divide both sides)
5x+3y=9
Step 2) 7y=7 (eliminate one variable by adding the equations)
Answer 5) y=1
Step 3) 5x+3*1=9
Answer 5) x= 6/5
Step 1) -5x+3y=9
5x-y=17
Step 2) 2y=26
answer 6) y=13
step 3) 5x-13=17
answer 6) x=6
Step 1) -7x-8y=-23
8x+8y=24
answer 7) x=1
Step 2) 4*1+4y=12
answer 7) y=2
Step 1) -x-10/3y=-4/3
x=23
Answer 8) -13/2)
Answer 8) x=23