Question

Find the solutions? 3. x = –4y + 4

2x + 8y = 8
one
two
infinite
none
4. y = 6x + 2

3y – 18x = 12
one
two
infinite
none

Answer 1

3.\[x=-4y+4\]\[2x + 8y = 8 \]Substitute the expression for x in terms in y from the first equation into the second equation for x.\[2(-4y+4)+8y =8\]Mulitply out, combine like terms, rearrange and solve for y.

Answer 2

Same for 4.