The point (1,-4) is on the given line by which equation

Step-by-step explanation:

You haven't provided any equations!

You need to test each of the equations you have been given. Replace the x with 1 and the y with -4, then see if the equation holds true.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: