EmjayAnthonyLover EmjayAnthonyLover

21-03-2016
Mathematics

contestada

Solve the system by substitution.

y=−3x-2
-7x+3y=10

PLEASE HELP

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apologiabiology apologiabiology

21-03-2016

y=-3x-2
subsitute -3x-2 for y
-7x+3(-3x-2)=10
distribute
a(b+c)=ab+ac
3(-3x-2)=-9x-6

-7x-9x-6=10
add like terms
-16x-6=10
add 6
-16x=16
multiply -1
16x=-16
divide 16
x=-1

subsitute
y=-3x-2
y=-3(-1)-2
y=3-2
y=1

x=-1
y=1

(x,y)
(-1,1)

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