Answer:
x =2
Step-by-step explanation: 9 + 3x = 15
-9 + 3x = -9
3x = 6
divide both sides by 3
x = 2
the three other numbers are 2
y=2x-3 an x+y=3
subsitution
since y=2x-3, put (2x-3) wherever you see y
put taht in the other equation
x+y=3
x+(2x-3)=3
x+2x-3=3
3x-3=3
add 3 to both sides
3x=6
divide by 3
x=2
subsitute back
y=2x-3
y=2(3)-3
y=6-3
y=3
so the solution set in (x,y) form is (2,3)
Answer:
9km per litre
Step-by-step explanation:
Rate=180km/20l
Rate=9 km/l
5/6 + 1/4
multiply the denominators and numerators in order for equation to have the same denominators to help solve.
20/24 + 6/24
= 26/24
= 13/12
Hope you find this helpful!
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