Bernie's monthly phone plan can be represented by
the expression $0.10x + $20
where x represents the
number of minutes used. If
he talked for 300 minutes last
month, how much was his
phone bill?

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated

i think the answer is a.( -3, -1 )