Please help

Solve the system.

y-10=3x

2y=6x+20

A.(2, 13)
B.infinite solutions
C.(10, 40)
D.no solution

Question

Please help

Solve the system.

y-10=3x

2y=6x+20

         A.(2, 13)
	B.infinite solutions
	C.(10, 40)
	D.no solution

anonymous · Answer

first one can be written as $y=3x+10$ substitute in to the second and solve 
$$2(3x+10)=6x+20$$

anonymous · Answer

since when you distribute on the left you get 
$$6x+20=6x+20$$ you see you have an identity, true for all $x$ so infinitely many solutions

jkbo · Answer

thank you very much @satellite73

jkbo · Answer

@satellite73 can you help me with this one also?

Solve the following system by graphing and identify the point of intersection

5x-y=-9

x-y=-1

	A.(–1, –2)
	B.(–2, –1)
	C.(1, 2)
	D.(2, 1)