Question

Four times a first number is 1. the first number increased by twice the second number is -20

Answer 1

First number is x
second is y

4x=1
x+2y=-20

solve for x first
4x=1
divide by 4
x=1/4=0.25

sub
x+2y=-20
0.25+2y=-20
minus 0.25 from both sides
2y=-20.25
divide both sides by 2
y=-10.125

the first number is 0.25 the second is -10.125
or, in fraction form
the first number is 1/4 and the second is -10 and 1/8