Question

For questions 3–6, how many solutions does each system have?

3. x = –4y + 4
2x + 8y = 8 (1 point)
one
two
infinite
none
4. y = 6x + 2
3y – 18x = 12 (1 point)
one
two
infinite
none
5. x – 2y = 6
3x – 6y = 18 (1 point)
one
two
infinite
none
6. y – 5x = –6
3y – 15x = –12 (1 point)
one
two
infinite
none

Answer 1

x=-4y+4
put this in 2x+8y=8;
we get 2(-4y+4)+8y=8
now solve for y