Answer:
distributive
Step-by-step explanation:
the number out side the parenthesis, 3 in this case, is being distributed to the numbers inside the parenthesis
<span>Solve for x
-x=-5
multiply both sides by (-1)
</span>-x (-1) =-5 (-1)
simplify
x = 5
answer is 5 (positive 5)
Answer:
B
Step-by-step explanation:
20x+5y=120
10x+7.5y=80 multiply this one by 2
___________
20x+5y=120
20x+15y=160 subtract
___________
-10y=-40 divide both sides by -10
____________
y=4
20x+5(4)=120 plug 4 in for y in the first equation
20x+20=120 multiply
20x=100 subtract
x=5 divide to find x
