Answer:
55/7
Step-by-step explanation:
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First set up your two equations:
x + y = 90
x = 2y - 30
Then substitute what x equals in the second equation into the first equation:
(2y -30) + y = 90
Now solve for y:
3y -30 = 90
3y = 120
y = 40
Then use y = 40 and substitute the value for y into one of your original equations and solve for x. I'll choose the first one, but either one will work.
x+ 40 = 90
x = 50
So your solution is x = 50 and y = 40
Answer:
Multiplication
Step-by-step explanation:
Answer:
k = 2
Z = 3.5
Step-by-step explanation:
Z = kX/Y
Where,
X = 3
Y = 1
Z = 6
Find k
Z = kX/Y
6 = k3/1
Cross product
6 * 1 = 3k
6 = 3k
k = 6/3
k = 2
what is the value of Z when X equals seven and why equals four
X = 7
Y = 4
Z = ?
k = 2
Z = kX/Y
= (2*7)/4
= 14/4
= 3.5
Z = 3.5
