Graphs aren't mandatory, but they may help visual learners see why an equation works a certain way. Also, they are a visual tool to quickly find a solution to a problem. Furthermore, they help with presentations to quickly convey an idea to someone (who may not be well versed in mathematics).
For example, if you save $10 a week and already have $50 in a savings account, then the equation you graph is y = 10x+50. Here x is the number of weeks and y is the amount saved.
Now let's say you want to find out how many weeks it would take to have $90 total. You could use guess and check to get the answer. Or you could use algebra and the substitution property. The visual way would be to graph y = 10x+50 and y = 90 together to note how the two lines intersect at (4, 90) to indicate it will take x = 4 weeks to have y = 90 total.
Answer:
x = 27 and y = 17 is the solution the the given pair of equations.
Number of dinosaur's rib = x = 27
Number of dinosaur's arm = y = 17
9 and 4/9 because you're trying to get the denominator into the numerator as many times as possible. The most times 9 can go wholey into 85 is 9 times, this leaves 4 left over.
Answer:
x = -3
y = 3
Step-by-step explanation:
<u>Step 1</u>
X = 15 - 6y
<u>Step 2</u>
Replace x with 15 -6y in the second eqation
3(15 - 6y) + 4y = 3
45 - 18y + 4y = 3
45 - 3 = 18y - 4y
42 = 14 y
y= 3
find x:
X = 15 - 6(3)
x = -3
3.36242487588 is the answer