Question

Solve the system of equations by the substitution method.



Choose one answer.
a. (15, -5)
b. (-5, 15)
c. infinite number of solutions
d. no solution

Answer 1

y=1/3-10
plug y in solve

Answer 2

(15, -5)

Answer 3

x=3y+30

put this x value in next equation

2(3y+30)+6y=0

6y+60+6y=0
12y+60=0
12y=-60
y=-60/12
y=-5

now put y =-5 in x=3y+30

x=3*(-5)+30
x=-15+30
x=15

so (15,-5) is solution