Answer: BC=22cm
Step-by-step explanation:
5d-3=3d+7
2d=10
d=5
plug 5 into the equation for BC, and you get 22
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C makes it true always true.
Step-by-step explanation:
Answer: x=2 and y=−1
Step-by-step explanation:
5x+7y=3for x:
5x+7y=3
5x+7y+−7y=3+−7y(Add -7y to both sides)
5x=−7y+3
x=
−7/
5
y+
3
/5
Substitute
−7
/5
y+
3
/5 for x in2x+3y=1:
2(
−7/
5
y+
3
/5
)+3y=1
1
/5
y+
6
/5
=1(Simplify both sides of the equation)
1
/5
y=
−1
/5
y=1
Substitute −1 for y in x
−7
/5
y+
3
/5
:
x=
x=2
x=2(Simplify both sides of the equation)
Answer:
Step-by-step explanation:
For one, there can only be two variables, for two, two variables cannot be multiplied together. For example, xy + 2z= 4 is not linear.
