Answer:

Step-by-step explanation:

Hey.. I know you haven’t been able to find much help, but if you are still struggling this might help.
Try to set it up as an equation for example 25x +25=10x +15 and rewrite it in standard form and see if that helps
So we follow the format y=mx+c. we know the y intercept (c) is 2. the gradient is -1/2 which is a fraction. and then substitute
y=mx+c
y=mx+2
y= -1/2x +2
X + y= 30
.05x + .10y= 1.65
n + d = 30
5n + 10d = 165
-5n - 5d = -150
5n + 10d = 165
5d = 15
d = 3 dimes
n + 3 = 30
n= 27 nickels