7x+10y=36
y=2x+9
-2x+y=9 /*10
20x-10y=-90
+---------------------
27x=-54 //27
x=-2
-2(-2)+y=9
y=5
Answer:
x = -2, y = 5
Step-by-step explanation:
7x + 10y = 36
y = 2x + 9
7x + 10(2x + 9) = 36
7x + 20x + 90 = 36
27x = -54
x = -2
y = 2(-2) + 9
y = -4 + 9
y = 5
