60 pesos because its subtraction, it would be 90-30, which equals 60 pesos.
Answer:
3X+5Y=68 MULTIPLY BY 4
3Y-4X=6 MULTIPLY BY 3 & ADD.
12X+20Y=272
-12X+9Y=18
-----------------
29Y=290
Y=290/29
Y=10 ANS.
Step-by-step explanation:
-9 -4 = -13
-4 - 3 = -7
vector is <-13, -7>
