A system of equations is shown.
2 answers:
Answer:
x = 2, y = 5
Step-by-step explanation:
x + y = 7
2x - y = -1
3x = 6
x = 2
2 + y = 7
y = 5
Answer:
x = 2
y = 5
Step-by-step explanation:
Rewrite x + y = 7 to make y the subject:
⇒ y = 7 - x
Substitute y = 7 - x into 2x - y = -1 and solve for x:
⇒ 2x - (7 - x) = -1
⇒ 2x - 7 + x = -1
⇒ 3x = 6
⇒ x = 2
Now substitute x = 2 into one of the equations and solve for y:
⇒2 + y = 7
⇒ y = 5
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Root of 49
Solutions are 7 and -7
We know that 7 is the square root of 49.
A negative number multiplied by itself gives positive
So -7 is also a square root of 49
Answer:
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Step-by-step explanation:
