For number 19:
"at least 150" means either 150 ≤ ? or ? ≥ 150
plus 3 so +3x
The answer would be 150 ≤ 100 + 3x
Number 20:
A is at -2.5. The inverse is the opposite so 2.5
To add integers with different signs, keep the sign of the number with the largest absolute value and subtract the smallest absolute value from the largest.
Hope this helped.
Because both equations are equal to y, you can set the equations equal to each other.
2x+5= x+3
-x -x
x+5=3
-5 -5
x= -2
Then, you can substitute -2 to any equation to find x.
y= (-2)+3 y= 2(-2)+5
y= 1 y= -4+5
y=1
:
x=-2
y=1
